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Question: Zelma solved 180 problems from a math book in 6 days. Find the average number of problems she solved per day.


A ) 42
B ) 24
C ) 36
D ) 30

Steps to derive

1 Let n be the average number of problems solved by Zelma per day.

 [Write the data as an equation.]
2 6n = 180

 [Divide each side by 6.]
3 6n6 = 1806

 [Simplify.]
4 n = 30

5 The average number of problems solved by Zelma per day is 30.



Hence the right answer is Option D

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