yangsta8 wrote:
At a certain picnic, each of the guests was served either a single scoop of a double scoop of ice cream. How many of the guests were served a double scoop of ice cream?
1) At the picnic, 60 percent of the guests were served a double scoop of ice cream.
2) A total of 120 scoops of ice cream were served to all the guests at the picnic.
x - single scoop, y - double scoops. the question asks about y.
1: insufficient, only ratio y/(x+y) given
2: insufficient (x+2*y = 120, can't calculate y)
1+2: sufficient
y = 0.6*(x+y)
x+2*y = 120 -> sufficient to calculate y -> C