Question

You are given a 2 digit number. 1 times the number you get when you subtract its ones digit from its tens digit is 6;
7 times its tens digit plus 6 times its ones digit is equal to 81. What is the number ?

Answer 1

ok let the 10's digit be symbolized by=x
let the 1's digit by symbolized by =y
x-y=6
7x+6y=81

Answer 2

x-y=6 implies x=6+y
so 7x+6y=7(6+y)+6y=42+7y+6y=42+13y=81 so 13y=81-42=39
y=39/13=3
x=6+3=9
so the number is 93

Answer 3

thank you very much