What the answer to the question?:)

Which expression is equivalent to7_/x^2 ÷ 5_/y^3? assume y# 0

Will give a: 122 b: 90 c: 48 d: 180

Without multiplying, tell which product is larger and why. 5 × 1/3 or 5 × 2/3 a)5 × 1/3 because 1/3 is less than 2/3 b) 5 × 1/3 because 1/3 is greater than 2/3 c) 5 × 2/3 because 1/3 is less than 23 d) 5 × 23 because 1/3 is greater than 2/3