a) 93
b) 48
c) 39
d) 84
Answer: b
Explanation: Let the Original number is (X + 10Y)
Sum of the digit of the number = 12
X + Y = 12 ———– (1)
When digit interchanged, number become 36 more than original number,
10X + Y = 10Y + X + 36
X – Y = 4 ——————- (2)
On solving equation (1) and (2),
X = 8
Y = 4
Original number,
= X + 10Y = 8 + 10 × 4 = 48
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