Question

In 6th grade Lilly read 15 books. This year in 7th grade she rad 18 books. What is the percent of increase in the number books that Lilly read this year?

Answer 1

Answer: 20%

Explanation:

To solve this problem you must apply the proccedure shown below:

1. You must apply the following formula (Let's call the percent of increase:
`x`):

`x=((increase)/(original))(100)`

`increase=18-15\\original=15`

2. Substitute values and solve:

`x=((18-15)/(15))(100)\\`

`x=20`%