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?

20%

Step-by-step 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:):

2. Substitute values and solve:

%

let soccer = x and golf = y

part a

1st equation: x + y = 125

2nd equation: x = y +45

part b

replace x in the 1st equation with the 2nd one:

y + 45 + y = 125

simplify:

2y + 45 = 125

subtract 45 from each side:

2y = 80

divide both sides by 2:

y = 80/2

y = 40

she plays golf for 40 minutes.

part c

no because she plays soccer for 45 minutes longer than golf 40 +45 =   85 minutes, not 80 minutes.

step-by-step explanation:

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