Books cost 50 cent and pamphlets 15 cent at the book sale. If Mr. Jones spent $90 and purchased 15 more pamphlets than he did books, how many pamphlets did he buy?

Question

A) 75

B) 150

C) 33/4

D) 135

E) None of those

Answer 1

.5B + .15P = 90

P = 15 + B

B/2 + .15(15+B) = 90

(.65)B = 90-2.25 = 87.75

B = 87.75/.65 = 135 books

P = 15+135 = 150 pamphlets

.5(135) + .15(150) = 67.5 + 22.5 = 90