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 Re: إن شاءالله تفهم بس (Re: محمد البشرى الخضر)
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Ronald and Michelle have two children. The probability that the first child is a girl, is 50%. The probability that the second child is a girl, is also 50%. Ronald and Michelle tell you that they have a daughter.
The Question: What is the probability that their other child is also a girl?
Solution to: Boys and Girls
There are four possibilities for two children:
first child: second child:
1 girl girl
2 girl boy
3 boy girl
4 boy boy
The fourth possibility drops out, because Ronald and Michelle have a daughter. Therefore, three possibilities remain, of which in one case the other child is also a girl. So, the probability is 1/3 (about 33%).
دي دوما حلتها لكن نورد المعادلات للفائدة
4-
Charles walks over a railway-bridge. At the moment that he is just ten meters away from the middle of the bridge, he hears a train coming from behind. At that moment, the train, which travels at a speed of 90 km/h, is exactly as far away from the bridge as the bridge measures in length. Without hesitation, Charles rushes straight towards the train to get off the bridge. In this way, he misses the train by just four meters! If Charles would, however, have rushed exactly as fast in the other direction, the train would have hit him eight meters before the end of the bridge.
The Question: What is the length of the railway-bridge
Solution to: Train Trouble
Let the length of the bridge be x meters.
Running towards the train, Charles covers 0.5x-10 meters in the time that the train travels x-4 meters. Running away from the train, Charles covers 0.5x+2 meters in the time that the train travels 2x-8 meters.
Because their speeds are constant, the following holds:
(0.5x-10) / (x-4) = (0.5x+2) / (2x-8)
which can be rewritten to
0.5x2 - 24x + 88 = 0
Using the abc formula we find that x=44, so the railway-bridge has a length of 44 meters.
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| العنوان |
الكاتب |
Date |
| رياضة ذهنية...كل يوم تمرين حتى لا يتبلد الذهن | ombadda | 02-18-09, 05:42 PM |
| Re: رياضة ذهنية...كل يوم تمرين حتى لا يتبلد الذهن | النصرى أمين | 02-18-09, 06:13 PM |
| Re: رياضة ذهنية...كل يوم تمرين حتى لا يتبلد الذهن | محمد الأمين موسى | 02-18-09, 08:43 PM |
 Re: رياضة ذهنية...كل يوم تمرين حتى لا يتبلد الذهن | najma | 02-18-09, 09:23 PM |
| رد | ombadda | 02-18-09, 10:18 PM |
| Re: رد | ombadda | 02-18-09, 11:14 PM |
| Re: رد | ombadda | 02-18-09, 11:27 PM |
| Re: رد | ombadda | 02-18-09, 11:31 PM |
 Re: رد | ombadda | 02-18-09, 11:51 PM |
| Re: رد | Adil Hamza | 02-19-09, 00:37 AM |
| Re: رد | Adil Hamza | 02-19-09, 00:40 AM |
| Re: رد | ombadda | 02-19-09, 01:42 AM |
| Re: رد | ombadda | 02-19-09, 02:42 AM |
| Re: رد | فيصل عثمان الحسن | 02-19-09, 02:50 AM |
| Re: رد | SHIBKA | 02-21-09, 04:30 AM |
| ok | ناصر جامع | 02-19-09, 04:49 AM |
| Re: ok | Adil Hamza | 02-19-09, 05:11 AM |
| Re: ok | SHIBKA | 02-19-09, 05:37 AM |
| Re | Elawad | 02-19-09, 06:31 AM |
| Re: Re | د.نجاة محمود | 02-19-09, 07:16 AM |
| Re: Re | ombadda | 02-19-09, 09:55 AM |
| Re: Re | ombadda | 02-19-09, 09:57 AM |
| Re: Re | ombadda | 02-19-09, 10:02 AM |
| Re: Re | SHIBKA | 02-21-09, 05:09 AM |
| Re: Re | SHIBKA | 02-21-09, 08:19 AM |
| Re: Re | SHIBKA | 02-21-09, 04:39 AM |
| رد | ombadda | 02-19-09, 10:08 AM |
| Re: رد | ombadda | 02-19-09, 10:11 AM |
| Re: رد | ombadda | 02-19-09, 04:13 PM |
 Re: رد | salee | 02-19-09, 06:44 PM |
| Re: رد | Adil Hamza | 02-19-09, 04:42 PM |
| Re: رد | النصرى أمين | 02-19-09, 07:08 PM |
| ok | ناصر جامع | 02-19-09, 07:49 PM |
| ok | ناصر جامع | 02-20-09, 05:03 AM |
| عدد التحايا | Hafiz Bashir | 02-20-09, 12:09 PM |
| عدد التحايا | Hafiz Bashir | 02-20-09, 01:00 PM |
| Re: عدد التحايا | Adil Hamza | 02-20-09, 08:31 PM |
| salaam | ناصر جامع | 02-21-09, 01:50 AM |
| thanks | ناصر جامع | 02-21-09, 01:53 AM |
| Re: thanks | ابراهيم قناوي | 02-21-09, 06:51 AM |
| Re: thanks | ALZOLZATOO | 02-21-09, 12:08 PM |
| Re: thanks | SHIBKA | 02-21-09, 03:18 PM |
| Re: thanks | محمد البشرى الخضر | 02-21-09, 03:56 PM |
| Re: thanks | عبدالله احيمر | 02-21-09, 03:55 PM |
| Re: thanks | عبدالله احيمر | 02-21-09, 04:11 PM |
| Re: thanks | حامد محمد حامد | 02-21-09, 04:14 PM |
| Re: thanks | ombadda | 02-21-09, 05:16 PM |
| Re: thanks | ombadda | 02-21-09, 05:24 PM |
| Re: رياضة ذهنية...كل يوم تمرين حتى لا يتبلد الذهن | ASHRAF TAHA | 02-21-09, 05:26 PM |
| شبكة خطيييرة | ombadda | 02-21-09, 05:29 PM |
| Re: شبكة خطيييرة | ombadda | 02-21-09, 05:56 PM |
| Re: شبكة خطيييرة | محمد البشرى الخضر | 02-21-09, 06:06 PM |
| Re: ش | ombadda | 02-21-09, 06:10 PM |
| Re: ش | حامد محمد حامد | 02-21-09, 06:23 PM |
| Re: ش | محمد البشرى الخضر | 02-21-09, 07:02 PM |
 مشتاقققققققققققققققققققققققققققققققققققققققققققققققققين!!!! | ASHRAF MUSTAFA | 02-21-09, 07:12 PM |
| Re: مشتاقققققققققققققققققققققققققققققققققققققققققققققققققين!!!! | ombadda | 02-21-09, 07:37 PM |
| Re: شبكة خطيييرة | SHIBKA | 02-21-09, 07:28 PM |
| Re: شبكة خطيييرة | ASHRAF MUSTAFA | 02-21-09, 07:48 PM |
| لأقوياء الملاحظة | ombadda | 02-21-09, 07:49 PM |
| Re: أشرف مصطفى | ombadda | 02-21-09, 07:56 PM |
| Re: أشرف مصطفى | Abureesh | 02-21-09, 08:35 PM |
| Re: أشرف مصطفى | ASHRAF MUSTAFA | 02-21-09, 09:33 PM |
| Re: أشرف مصطفى | محمد الطيب حسن | 02-21-09, 10:16 PM |
| Re: أشرف مصطفى | Adil Hamza | 02-21-09, 09:47 PM |
| Re: لأقوياء الملاحظة | SHIBKA | 02-22-09, 06:22 AM |
| abureesh | haider osman | 02-21-09, 10:14 PM |
| Re: abureesh | عبدالله احيمر | 02-22-09, 05:58 AM |
| Re: abureesh | ناصر جامع | 02-22-09, 06:56 AM |
| Re: abureesh | ناصر جامع | 02-22-09, 07:10 AM |
| Re: abureesh | ALZOLZATOO | 02-22-09, 07:51 AM |
| Re: abureesh | doma | 03-19-09, 04:11 AM |
| Re: abureesh | SHIBKA | 02-22-09, 07:48 AM |
| Re: abureesh | عبدالله احيمر | 02-22-09, 08:11 AM |
| Re: abureesh | SHIBKA | 02-22-09, 08:48 AM |
| Re: abureesh | محمد الطيب حسن | 02-22-09, 12:03 PM |
| Re: abureesh | SHIBKA | 02-22-09, 12:12 PM |
| Re: abureesh | SHIBKA | 02-22-09, 12:14 PM |
| Re: abureesh | SHIBKA | 02-22-09, 10:43 AM |
| Re: abureesh | SHIBKA | 02-22-09, 10:44 AM |
| Re: abureesh | ALZOLZATOO | 02-22-09, 11:02 AM |
| Re: abureesh | ALZOLZATOO | 02-22-09, 11:08 AM |
| Re: abureesh | SHIBKA | 02-22-09, 03:09 PM |
| Re: abureesh | ombadda | 02-22-09, 11:14 AM |
| Re: abureesh | عبدالله احيمر | 02-22-09, 11:16 AM |
| Re: MPH | ombadda | 02-22-09, 11:36 AM |
| Re: MPH | ombadda | 02-22-09, 11:40 AM |
| Re: MPH | الزنجي | 02-22-09, 11:49 AM |
| Re: MPH | SHIBKA | 02-22-09, 03:18 PM |
| Re: abureesh | الحوت | 02-22-09, 11:54 AM |
| Re: abureesh | حامد محمد حامد | 02-22-09, 12:49 PM |
| Re: abureesh | Adil Hamza | 02-22-09, 01:14 PM |
| Re: abureesh | Adil Hamza | 02-22-09, 01:24 PM |
| Re: abureesh | SHIBKA | 02-22-09, 03:16 PM |
| Re: abureesh | SHIBKA | 02-22-09, 03:21 PM |
| Re: abureesh | SHIBKA | 02-22-09, 03:12 PM |
| Re: abureesh | Adil Hamza | 02-22-09, 03:36 PM |
| Re: abureesh | SHIBKA | 02-22-09, 04:12 PM |
| Re: abureesh | حامد محمد حامد | 02-22-09, 03:46 PM |
| Re: abureesh | Adil Hamza | 02-22-09, 04:27 PM |
| Re: عادل حمزة يا خطيييييييير | ombadda | 02-22-09, 04:48 PM |
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محمد البشرى الخضر
فيس بوك
تويتر
انستقرام
يوتيوب
بنتيريست