In a bag of gumballs, 30% are blue. there are 21 blue gumballs in the bag.

how many gumballs are there in all?

a. 30

b. 51

c. 63

d. 70

e. 91

Adecorative window is made up of a rectangle with semicircles at either end. the ratio of ad to ab is 3: 2 and ab is 30 inches. what is the ratio of the area of the rectangle to the combined area of the semicircles? possible answers: a. 2: 3 b. 3: 2 c. 6: π d. 9: π e. 30: π