Question

the unit digit of a two digit number is 3 and seven times tthe sum of the digits is the number irself find the number

Answer 1

let ones digit =x
then the number is equal to 7(x+3)
7x+21=10x+3
7x-10x=3-21
-3x=-18
x=6
then the number is 63
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Answer 2

Hey

Here is your answer,

let the no be x3

now (x+3)x7=10xx +3

7x + 21=10x + 3
3x = 18
x=6

so the no. is 63

Hope it helps you!