Question

the unit digit of a two digit is 3.the number is seven times the sum of the digits.find the number
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Answer 1

Answer:

63

Explanation:

Since unit digit is 3 ; let tens digit be 10 x .

Number = 10x + 3

sum of digits = x +3

Thus number = 7 (x + 3)

But number = 10x + 3

So , equating ;

10x + 3 = 7x + 21

3x = 18

x = 6

Thus number is

=6 * 10 + 3

=63

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