According to the meaning of the question, the old man is X and the young man is Y.

x=y+ 10

x-4=2(y-4)

x=24

y= 14

Question 2

I'll teach you a simple method. This kind of problem is called method of substitution.

Because x=2 is the solution of the equation aX+b=c about x.

Then substitute x=2 into the equation, and A and B can take any number to satisfy the equation.

Here I take A = 1 and b= 1, so c=3.

2a+b-c- 1=- 1

The even power of-1 is equal to 1.

C-B-2A-9 =-9. His absolute value is 9.