If 222 = 6
333 = 12
444 = 20
Then, 555 = ??  Choose the most appropriate option.
A) 30
B) 35
C) 40
D) 45
E) 50

Rationale: 222 = 2 * 2 + 2 = 6 333 = 3 * 3 + 3 = 12 444 = 4 * 4 + 4 = 20 555 = 5 * 5 + 5 = 30 answer : a
Answer: A