In the following sum, '?' stands for which digit :
? + 1? + 2? + ?3 + ?1 = 21?
A. 4
B. 6
C. 8
D. 9
Answer: Option C
Solution (By Examveda Team)
Let the required digit be xThen,
⇒ x + 1x + 2x + x3 + x1 = 21x
⇒ x + 10 + x + 20 + x + 10x + 3 + 10x + 1 = 200 + 10 + x
⇒ 22x = 210 - 34 = 176
⇒ x = 8
Hence, the required digit is 8
This Question Belongs to Arithmetic Ability >> Number System
Join The Discussion