Calculate the area: 10 ft
12 ft
8 ft
16 ft
a
b
o
144 sqft
100 sqft
152 sqft
140 sqft
с

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:

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