Question

In a 2-digit number ,sum of digits is 7.If the difference of two digit number and the number obtained by reversing the digits is 9, then find the number

Answer 1

Answer:

Let the units digit be x and tens digit be y

then,

x+y=7...(i)

Original number ⇒10y+x

Reversed number ⇒10x+y

A.t.Q:−(10y+x)−(10x+y)=−9

9y−9x=−9

−x+y=−1...(ii)

By solving (i) & (ii)

x=4,y=3

Number: 34

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