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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
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- 2
- 3
- 4
- 6
- 2
Correct Option: A
According to question ,
Difference in average = 1.8
∴ Difference between the number and the number formed by interchanging the digits = 1.8 × 10 = 18 (∴ 53 – 35 = 18)
∴ Number = 35
∴ Difference of digits = 5 – 3 = 2
