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A student finds the average of 10, 2 - d...

A student finds the average of 10, 2 - digit numbers. If the digits of one of the numbers is interchanged, the average Increases by 3.6. The difference between the digits of the 2-digit numbers is:

A

4

B

3

C

2

D

5

Text Solution

Verified by Experts

The correct Answer is:
A
माना कि संख्या (जो गलत लिखी गई) प्रारंभ में `10x + y` थी।
`therefore` अंकों को पलटने पर बनी संख्या = `10y +x `
प्रश्नानुसार, `10x + y-(10y +x) = 3.6xx 10 `
`implies 9x - 9y = 36`
`implies x-y = 4 `
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