Question

The units digit of a 2-digit number is 3.The number is seven times the sum of digits.Find the number.

Answer 1

Unit digit of a two digit no = 3

Let digit at tens place be x

Two digit No. = 10 * tens place + 1 * ones place

= 10x+3

7(x + 3) =10x + 3

7x + 21 = 10x+3

21-3 = 10x-7x

x=18/3

x=6

Two digit no = 10*6+3

= 60+3

= 63