A) 36
B) 63
C) 48
D) 84
Correct Answer: C
Solution :
[c] Let unit's digit: x |
Tens digit: y |
Then, \[x=2y\] |
Number \[=10y+x\] |
Also, \[10y+x+36=10x+y\] |
\[9x-9y=36\] |
or \[x-y=4\] |
Solve. \[x=2y\] |
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