Simplify this expression:
10а — ба + 2а

Step-by-step explanation:

Start with:

Combine like terms:

Allen=A
Bob=B
Jane=J
So what we know is 
A=4B
J=2A
A+J=432
What we want to know is
A+J+B=?
So we need to solve for B
The easiest way would be to substitute into the A+J equation so
A+(2A)=432
3A=432
A=144
And we know that 4A=B so 4(144)=B thus B= 576
So 432+576=1008!