Daniel is making a cube using blocks. the cube is solid and has no holes.

how many cubes did daniel use?

a.
81

b.
243

c.
486

d.
729

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:

good luck on your studies! : )

david edward.