Discussion Forum



1)

In the following sum, '?' stands for which digit ?

? + 1? + 2? + ?3 + ?1 = 21?


A) 4

B) 6

C) 8

D) 9

Answer:

Option C

Explanation:

Let x + (10 + x) i (20 + x) + (10x + 3) + (10x + 1) = 200 + 10 + x.

Then, 22x - 176<=> X = 8.