Mary bought pound of two sorts of cookies for $1 per pound. If cookie with apricot jam $0.90 per pound and cookies with lemon jam $1.20 per pound, how many pounds of cookies with apricot jam did she buy? NOTE: Round your answer to the nearest tenth.
A) 0.7 lb. of cookies with apricot jam
B) 0.8 lb. of cookies with apricot jam
C) 0.5 lb. of cookies with apricot jam
D) 0.6 lb. of cookies with apricot jam
E) 0.9 lb. of cookies with apricot jam

Question

Quizplus · Accepted Answer

Let x be the pounds of apricot cookies and y be the pounds of lemon cookies. We have the equations: x + y = 1 and 0.9x + 1.2y = 1. Solving these, we find x = 0.7.

Mary Bought Pound of Two Sorts of Cookies for $1