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
Related Questions on Number System
Three numbers are in ratio 1 : 2 : 3 and HCF is 12. The numbers are:
A. 12, 24, 36
B. 11, 22, 33
C. 12, 24, 32
D. 5, 10, 15
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