A student got twice as many sums wrong as he got right. If he attempted 54 sums in all, how many did he solve correctly ?
Choose one:
A) 12
B) 16
C) 18
D) 24
E) 26

Rationale: "explanation : suppose the boy got x sums right and 2 x sums wrong . then , x + 2 x = 54 3 x = 54 x = 18 . answer : c"
Answer: C