Question

Divide 72 rolls into 2 groups so the ratio is 3 to 5.

Answer 1

3+5=8

72/8=9

9x3=27
9x5=45

27:45

Answer 2

$3x\ and \ 5x\\\\ 3x+5x=72\\ 8x=72\ \ \ |divide\ by\ 8\\x=9\\\\ 3x=3*9=27\\ 5x=5*9=45\\\\ Ratio\ of\ rolls:\ \ 27:45.$