Subject: mathqa
Question: a number x is multiplied by 7 , and this product is then divided by 3 . if the positive square root of the result of these two operations equals x , what is the value of x if x ≠ 0 ?
Option: 
A: 9 / 25
B: 7 / 3
C: 5 / 3
D: 3 / 5
Answer: B