Question

In a two digit number, the unit digit is 7 more than tens digit. Sum of digits is an half of the number. Find the number

Answer 1

Answer:

18

Step-by-Step Solution:

let tens digit be x and units digit be y

The number =10x+y

x=y-7

x+y=(10x+y)/2

But x=y-7

Thus,2(y-7+y)=10(y-7)+y

4y-14=11y-70

56=7y

y=8 and x=y-7=1

Answer 2

Answer:

18

Step-by-step explanation:

let tens digit be x and units digit be y

The number =10x+y

x=y-7

x+y=(10x+y)/2

But x=y-7

Thus,2(y-7+y)=10(y-7)+y

4y-14-11y-70

56=7y

y=8 and x=y-7=1