87 = 9/5 c + 32
what does c equal? ?

c = 30.56 to the nearest hundredth

Step-by-step explanation:

87 = 9/5 c + 32

87 - 32 = 9/5 c

9/5 c = 55

multiply both sides by 5/9:

c = 55*5 / 9

c = 30.56.

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so: