Help please?

Question

Subtract 7 and 4/5 from 18 and 6/15 and reduce your answer to lowest terms

A. 11 and 9/15
B. 11 and 1/5
C.10 and 12/15
D. 10 and 3/5

Answer 1

7 4/5 = 39/5
18 6/15 = 276/15

39/5 x 3/3 = 117/15

276 - 115 = 159

so, the answer in unreduced form is 159/15

that reduces to 10 9/15, which reduces further to 10 and 3/5, so the answer is D

Answer 2

You notice that 12/15 in C is the same as 3/5 in D.