The tens digit of a two-digit number is two more than its unit digit. the two-digit number is 7 times the sum of the digits. find the units digits?
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consider unit digit= x
tens digit = x+2
two digit number is writen as 10(x+2) + x
10(x+2)+x =7((x+2)+x)
11x +20 = 7(2x +2)= 14x +14
20 -14 = 14x - 11x
6 = 3x
x = 2
the number will be 10(2+2)+2 = 42
unit digit = 2
tens digit = x+2
two digit number is writen as 10(x+2) + x
10(x+2)+x =7((x+2)+x)
11x +20 = 7(2x +2)= 14x +14
20 -14 = 14x - 11x
6 = 3x
x = 2
the number will be 10(2+2)+2 = 42
unit digit = 2
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