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by tsmith93 » Wed Mar 03, 2010 5:56 pm
A girl keeps a record of time she spende practicing her trumpet. On Monday she spends 1 and 1/4 hours; on Tuesday and Wednesday she spends 2 hours each day; on Thursday she spends 1 and 3/4 hours. How many hours will she have to spend practicing for the rest of the week in order to have exactly 90 minutes each day?
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by papgust » Wed Mar 03, 2010 6:02 pm
Where are the answer choices firstly? Remember that you could solve many questions using answer choices.

Ok, coming to the question. Convert everything into minutes,

Monday - 75 min
Tuesday - 120 min
Wednesday - 120 min
Thursday - 105 min

Rest of the week (3 days left).

Average time is 90 min. Sum of all day's time is 90*7 = 630 min
Time already spent = 75 + 120 + 120 + 105 = 420 min

Remaining time left = 630 - 420 = 210 min.

The question asks for number of hours = 210/60 = 3.5 hrs.
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