Let, the numbers = x,y
x+y= 24 1st eqn
x-y = 44 2nd eqn
24-y-y = 44
-2y = 44-24
y = 20/-2 = -10
substitute that in equation 1st x = 24+10 = 34
so, the numbers would be 34 & -10
Harry made $10,000 that the end of the year.
He's using the graduated cylinder method. I think the volume might be between 15 and 20. (It's kind of not obvious...)
5x7= 35
35> (greater than) 8