When 10025 - 25 is written in decimal notation, the sum of its digits is :
A. 444
B. 445
C. 446
D. 448
Answer: Option A
Solution(By Examveda Team)
10025 - 25= (102)25 - 25
= 1050 - 25
$$ = \underbrace {\,1000\,.....00\,}_{50\,{\text{zeros}}} - 25$$ $$ = \underbrace {\,9999\,.....\,9975\,}_{48\,{\text{times}}}$$
∴ Sum of digits
= (48 × 9) + 7 + 5
= 432 + 7 + 5
= 444
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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