Answer:
Ben saved 28 dollars
Explanation:
Let b = the money Ben saved.
Let p = the money Penny saved.
b = 2p
p + b = 42 Substitute 2p for b and solve for p
p + 2p = 42 Combine like terms
3p = 42 Divide both sides by 3
p = 14
Penny saved 14 dollars.
b = 2p substitute 14 for p
b = 2(14)
b = 28
Ben saved 28 dollars.