
Patrick B. answered 12/31/18
Math and computer tutor/teacher
We know the least about Elliot.
That is where to assign the variable.
x is Elliot age, Penelope is P, Jose is J....
P = 4J
J = x+3
In terms of x,
P = 4(x+3) = 4x + 12
P + J + x = 57
4x+12 + x+3 + x = 57
6x + 15 = 57
6x = 42
x=7
Elliot is 7, Jose is 10, Penelope is 40