SAT Question of the Day June 6th 2013
Milk costs cents per half-gallon and cents per gallon. If a gallon of milk costs cents less than half-gallons, which of the following equations must be true?
We can buy milk either in one or half gallon containers.
We pay Y cents per one gallon and X cents per half gallon.
If we buy two half gallons of milk we pay another Z cents than if we buy a one gallon container.
In Math we will write 2X=Y+Z or 2X-Y-Z=0
You can try it with numbers: 10 cents for a gallon 6 cents for each half gallon and 2 cents for the difference between buying a gallon or buying two half gallons.
57% out of 141,000 got it right.