Question

the one digit of a two digit number is one less than the tens digit. One-half the sum of the ones digit and double the tens digit is 13. Find the number and show your work.

Answer 1

One digits is y & ten's is X
according to question x-y=1 or x=1+y
1/2 (y+2×)=13
y=8 &x= 9
number is 98