1.

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 ?

Answer»

Let the two-digit number be 10a + b

a = b + 2 --- (1)

10a + b = 7(a + b) => a = 2B

Substituting a = 2b in EQUATION (1), we get 

2b = b + 2 => b = 2

HENCE the units digit is: 2.

Let the two-digit number be 10a + b

a = b + 2 --- (1)

10a + b = 7(a + b) => a = 2b

Substituting a = 2b in equation (1), we get 

2b = b + 2 => b = 2

Hence the units digit is: 2.


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