Question

Divide 7/15 by 3/5 A. 7/9 B. 75/21 C. 21/75 D. 7/25

Answer 1

$\frac{7}{15} \div \frac{3}{5}=\frac{7}{15} \times \frac{5}{3}=\frac{7}{3 \times \not5} \times \frac{\not 5}{3}=\frac{7}{3 \times 3}=\frac{7}{9} \Rightarrow \hbox{the answer is A}$

Answer 2

7/15 ÷ 3/5 =
= 7/15 * 5/3 =
= 7/3 * 1/3 =            (after simplifying)
= 7/9

Correct answer: A

Just keep in mind that dividing one fraction by another fraction is as much as multiplying the same fraction by an inverse of the second one.