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July 4th, 2011, 11:08 AM   #1
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ten boys can rob 30

Sir, please sir, I'm asking really because I don't know to solve:

ten boys can rob 30 shops in 60 days. In how many days 5 boys can rob 15 shops?
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July 4th, 2011, 12:54 PM   #2
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Re: ten boys can rob 30

Perhaps the simplest way to answer this is to observe that since both the number of boys and number of shops is divided by 2, the number of days would remain the same.
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July 4th, 2011, 03:26 PM   #3
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Re: ten boys can rob 30

Thanks Mark, I understand.
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July 5th, 2011, 05:04 AM   #4
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Re: ten boys can rob 30

sir sorry sir i think here my concept is not clear sir can you please tell me how to solve this sir sorry
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July 5th, 2011, 10:06 AM   #5
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Re: ten boys can rob 30

If 10 boys can rob 30 shops in 60 days, then (assuming each boy does an equal amount of robbing at a constant rate) each boy robs 1 shop every 20 days. So, 5 boys will rob 5 shops every 20 days, and thus 5 boys will rob 35 = 15 shops in 320 = 60 days.

Or, you can say 1 boy robs 3 shops every 60 days, thus 15 = 5 boys rob 35 = 15 shops every 60 days.
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