A student got twice as many sums wrong as he got right. I...
A student got twice as many sums wrong as he got right. If he attempted 48 sums in all, how many did he solve correctly ?
12
16
18
24
Correct answer is B
Suppose the boy got x sums right and 2x sums wrong.
Then, x + 2x = 48 ⇔ 3x = 48 ⇔ x = 16.