Discussion Forum



1)

A number is doubled and 9 is added. If the resultant is trebled, it becomes 75. What is that number ?


A) 3.5

B) 6

C) 8

D) 9

E) None of these

Answer:

Option C

Explanation:

Let the number be $x$.
Then, $3(2x+9)=75$
$\Leftrightarrow 2x+9 = 25$
$\Leftrightarrow 2x = 16 \Leftrightarrow x = 8$.