Justin has $7.50 more than Eva, and Emma has $12 less than Justin. Together, they have a total of 63.00. How much money does each person have?

Since no value is given to Eva, we'll call her x. Justin, then, is 7.50+x. That leaves Emma, who would be Justin (7.50+x) - 12. If we add them all together we get 63. So our equation is

x + (7.50+x) + (7.50+x) - 12 = 63

Combine like terms

x+x+x + 7.50+7.50-12 = 63

3x + 3 = 63

3x = 60

x = 20

Since we said Eva is x then Eva has 20 dollars.

Justin is 7.50 + x so 7.50+20=

$27.50

Emma is Justin - 12 so 27.50-12 = $15.50

Let's check our answer ...

15.50+27.50+20 = 63

63=63

It checks!