l+m + = 170 and m+C = 150 how much more is l than c

Question

L and M weigh 170. M and C weigh 150. L weighs how much more than C

Answer 1

So l =170-m, and c=150-m

I-c= 170-m-(150-m) = 170-m-150+m =20

so 20 more.