1 cookie=number/number where number stays constant so 1 cookie=1/1,2/2,3/3,4/4,5/5, etc
so if 3/4 of cookie eaten the bottom number tells how many in the whole or 1 so whole=4/4 4/4-3/4=1/4 1/4=not eaten equivilent, multiply top and bottom number by same number 1/4 times 2/2=2/8 1/4 times 4/4=4/16