Question

Keesha has 10 more quarters than dimes which total 11.25. How many coins does she have in quarters and dimes

Answer 1

let q = number of quarters
let d = number of times

q = 10 + d

and

0.25q + 0.10d = 11.25

Answer 2

let 'x' be the number of dimes
'y' be the number of quarters
0.10x + 0.25y = 11.25 ----equation 1
y = 10 + x ----equation 2
substitute equation 2 to equation 1
0.10x + 0.25(10+x) = 11.25
0.10x + 2.5 + 0.25x = 11.25
find x
substitute the value of x to equation 2