Today your child practices solving another one of those “mental math” problems that he worked on at the beginning of the course only this time he can use the techniques for solving two independent equations that have 2 unknowns.
DoodlePig helps your child set up the problem, and it is kind of an easy one, so try not to let him just jump to the answer mentally, but if he does, rejoice that you have an intelligent child and move on.
1. A+100=B and B+100=2A
A=$200 and B=$300