Diane , Juan and bill have a total of $90 in their wallets . Diane has $10 more than bill . Juan has 3 times what bill has . How much does each have

Question

I do Not understand the x variables 

Answer 1

d + j + b =90

 

d = b + 10

 

j = 3b

 

Substitute:

 

(b + 10) + (3b) + (b) = 90

 

5b + 10 = 90

 

5b = 80

 

b = 16

 

j = 48

 

d = 26