(Answer: 21/4)
Explanation:
6 (7/8)
|Think of 6 as 6/1|
6 . 7 = 42 (/2) = 21
1 8 8 (/2) 4
When multiplying 2 fractions, the numerators multiply by the other numerator and the same for the denominator (bottom part of fraction).
When you divide one side by 2, you have to do the same to the other side.