Exercise 1 Page 125

Let's start by recalling that the percent proportion is a proportion that sets the ratio of a part of a whole equal to the ratio of a percent out of 100. part/whole=percent/100 We want to find what percent of 60 is 15. Let n represent the percent. 15/60=n/100 Now we can solve the proportion we got for n. Let's do this by using the fact that the cross products of any proportion are equal.

15/60=n/100

CrossMult

Cross multiply

15* 100= 60 * n

Multiply

Multiply

1500=60n

Finally, we will use the Division Property of Equality to get the value of n.

1500=60n

DivEqn

.LHS /60.=.RHS /60.

1500/60=60n/60

CancelCommonFac

Cancel out common factors

1500/60=60n/60

SimpQuot

Simplify quotient

1500/60 = n

CalcQuot

Calculate quotient

25 = n

RearrangeEqn

Rearrange equation

n = 25

We got that n= 25 is a solution to the proportion. This means that 15 is 25 % of 60.