Question

the unit digit of a two digit number is 3 and seven times the sum of the digit is the number itself. find the number

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Answer 1

Step-by-step explanation:

Let the tens digit be x and unit digit is 3.

$7(x + 3) = 10x + 3$

$7x + 21 = 10x + 3$

$3x = 18$

$x = 6$

So the number is 63

Answer 2

welcome to the concept of linear equations

Let the tens digit be x and unit digit is 3.

7(x + 3) = 10x + 3

7x + 21 = 10x + 3

3x = 18

x = 18/3

X= 6

then the number is 63

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