George's car calls for 8 ounces of oil for each cylinder used. His car's engine has 6 cylinders. If 16 ounces of oil has already been put into the engine used, then how many additional ounces of oil are needed?
Select.
A) 16 B) 48 C) 64 D) 32 E) 8

Rationale: number of ounces per cylinder 8 number of cylinders 6 ounces needed 48 ounces used 16 answer d
Answer: D