Question

isobel and marnie volunteer at a daycare center Isobel works 3 hours for every 2 hours marine works. if the two girls together work 20 hours on month, how many hours does Isobel work?

Answer 1

i=1.5m
m+1.5m=20
2.5m=20
m=8
20-8=12
Isobel worked 12 hours.