Question

In the 6th grade, Miguel read 15 books. In 7th grade, he read 21 books. What was the percent change in the number of books Miguel read from 6th to 7th grade?

Answer 1

In the 6th grade, he read = 15 books

In the 7th grade, he read = 21 books

The difference between the books he read = 21-15 =6 books

Total number of books from 6th to 7th grade = 15+21 = 36 books

So, the percentage of change in the number of books

`\begin{gathered} \text{ Percentage = }\frac{Difference\text{ in the number of books}}{\text{Total number of books}}*100 \\ \text{ Percentage=}(6)/(36)*100 \\ \text{ Percentage=}(1)/(6)*100 \\ \text{Percentage}=16.66 \end{gathered}`

Percentage in the number of books Miguel read from 6th to 7th grade? is 16.66%