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The sum of the digits of a two digit number is 7. When the digits are reversed, the number is decreased by 9. Find the number.

Answers (1)

Assume the number is ab.

 ATQ

a + b = 7 ....(i)

10 a + b - 10b - a = 9

9( a - b) = 9 

a - b = 1....(ii)

Equation (i) + Equation (ii)

2a = 8   => a =4

b = 3

Hence the required number is 43.

 

Posted by

Ravindra Pindel

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