Unicornrabbit

Even just an approach to my question? Anyone?

First, we should assign variables.

Sandra’s Age = X + 18

Paolo’s Age = X

In 13 years, they will be:

(X + 18) + 13 = 2(x + 13)

X + 18 + 13 = 2x + 26

X + 31 = 2x + 26

X – 2x = 26 - 31

-x/-1 = -5/-1

X = 5

Therefore, Sandra is now:

Sandra’s Age = 5 + 18 = 23

Sandra is now 23 years old.

Checking their age:

23 (Sandra) – 5 (Paolo) = 18

If z>=0,
2+z > 1 -- z > -1
2-z <= -1 -- z >= 3

If z<0,
2-z > 1 -- z < 1
2+z <= -1 -- z <= -3

If you graph on a number line, you will find your answer. Check a few values to make sure they work, especially at the boundaries.

We can make a variable a to be his age.

36+a = 2.5a
36 = 1.5a
24= a

proof: 2.5*24 = 60 = 24+36

Does that help?

Oh i looked it up sounds cool