a number consist of two digits of which tens digit exceeds the unis digit by 7 the number itself is equal to 10 times the sum of its digit find the number

Answer 1

unit digit --- x
tens digit --- x+7

10(x+7) + x = 10(x + x+7)
10x + 70 = 20x + 70
10x = 0
x = 0

so the number is 70

Answer 2

a number consists two digit number of which tens digit exceeds the unit digit 7. the number itself is equal of 10 times the sum of its digits find the number