A student finds the average of ten 2-digit numbers. While copying numbers, by mistake, he writes one number with its digits interchanged. As a result his answer is 1.8 less than the correct answer. The difference of the digits of the number, in which he made mistake, is
Options:
A . 3
B . 2
C . 6
D . 4
Answer: Option B Answer: (b)Difference in average = 1.8 ∴ Difference between the number and the number formed by interchanging the digits = 1.8 × 10 = 18 (Since 53 – 35 = 18) ∴ Number = 35 ∴ Difference of digits = 5 – 3 = 2
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