In the first two weeks of school, Jill studied 20 hours and 22 hours, respectively. How many hours must she study during the third week to give her an average of 25 hours per week?

A) 21 hours
B) 33 hours
C) 33.5 hours
D) 25 hours

The question is essentially asking for an application of the formula for an average. To determine how many hours Jill must study in the third week to attain an average of 25 hours per week, we need to understand the principle of averages.

The average is calculated by adding all numbers in the set and then dividing by the quantity of numbers. Therefore, if she studied 20 hours in the first week and 22 hours in the second week, then to make an average of 25 hours over three weeks, the total hours studied must be 25 x 3 = 75 hours.

Taking into account the hours she has already studied, we subtract from this total:

75 - 20 - 22 = 33 hours.

So, Jill must study 33 hours in the third week to achieve an average of 25 hours per week.

The answer is B

Learn more about Averages here:

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In the first two weeks of school, Jill studied 20 hours and 22 hours, respectively. How many hours must she study during the third week to give her an average of 25 hours per week?A) 21 hours B) 33 hours C) 33.5 hours D) 25 hours

Answer :

Other Questions

In the first two weeks of school, Jill studied 20 hours and 22 hours, respectively. How many hours must she study during the third week to give her an average of 25 hours per week?

A) 21 hours
B) 33 hours
C) 33.5 hours
D) 25 hours