If it takes only 10 minutes to solve a math problem and I have to solve 15 problems by 10:30 am today, then by what time should I start solving the problems?
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To solve 15 problems you will need 15×10 = 150 minutes that is 2 hours 30 minutes
As you have to finish doing the sun by 10.30 we will move 2 hours 30 minutes back from 10.30
Which is 8.00 clock. The time that you should start doing the sum is 8.00 am.
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