Answer:
With sample sizes greater than 30, 36 university women. so 66
A(b-c)=ab-ac
(1/7)(1/3h-1/2)=(1/7)(1/3h)-(1/7)(1/2)=1/21h-1/14
now we gots
6 and 1/7+1/21h-1/14
rearange
6 and 1/7-1/14+1/21h
make common denom which is 14
6 and 2/14-1/14+1/21h
6 and 1/14+1/21h
He ate 7/12 of the pizza because 1x4=4, 1x3=3, 4+3=7, and 4x3=12.
Hope that helps.