1.25 as a decimal and percent show work

  1.25 = 5/4 = 125%

Percentage

Multiply by 100% to express it as a percentage:

  1.25 × 100% = 125%

Fraction

You can recognize that % means /100, so this percentage is the same as the fraction

  125% = 125/100

Factors of 25 can be removed from numerator and denominator to reduce the fraction.

  125/100 = (25·5)/(25·4) = 5/4

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:

let m = monomial

let t = trinomial

so, m times t = t.

monomial times a trinomial = another trinomial.