Isabella collects a bunch of dimes and quarters for her school fundraiser. She collected a total of 211 coins and a total of $37.30. how many dimes and how many quarters did she collect.

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:

f is the midpoint of