A number x is multiplied by 5, and this product is then divided by 7. If the positive square root of the result of these two operations equals x, what is the value of x if x≠0 ?
Choose the correct answer.
A) 25/9  B) 9/5  C) 5/7  D) 3/5  E) 9/25
sqrt(5x/7) to be perfect square x has to 5/7   Ans: 5/7
<result>C</result>
A number x is multiplied by 5, and this product is then divided by 7. If the positive square root of the result of these two operations equals x, what is the value of x if x≠0 ?