Question

A two digit number is 7 times the sum of its
digits. If the difference between two algs is
2, find the number.​

Answer 1

Let the unit's digit be x .

There fore , ten's digit will be ( x + 2 ) .

There fore , the number is 10 ( x + 2 ) + x

= 10 x + 20 + x

= 11 x + 20 .

According to the question ,

11 x + 20 = 7 ( x + x + 2 )

=> 11 x + 20 = 14 x + 14

=> 3 x = 6

=> x = 2 .

There fore , units digit = 2 .

So , tens digit = 4 .

So the number is 42.

But it can also be the other way round , that is , units digit be 4 and tens digit be 2 .

In that case, the number will be 24 .

Answer 2

Answer:

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