Donna made 5 posters.
Elizabeth made twice as many posters as Donna.
They hung up 7 posters.
How many posters do they have left?

Mr. Sanchez baked 4 muffins.
Mrs. Sanchez baked twice as many muffins.
They sold 7 muffins.
How many muffins were left?

Kim took 6 pictures.
Michael took twice as many pictures.
How many pictures did they take together?

Gail made 3 snowballs.
Luis made twice as many snowballs.
How many snowballs did they make together?

John built 5 birdhouses.
Eddie built twice as many as John.
They sold 9 birdhouses.
How many were left?