A number x is multiplied by 7, and this product is then divided by 5. If the positive square root of the result of these two operations equals x, what is the value of x if x≠0 ? Choose one.
A) 25 / 9 B) 9 / 5 C) 5 / 3 D) 7 / 5 E) 9 / 25

Rationale: sqrt ( 7 x / 5 ) to be perfect square x has to 7 / 5 ans : d
Answer: D