Mary bought pound of two sorts of cookies for $1 per pound. If cookies 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

Using the method of weighted averages, we can set up the equation: 0.9x + 1.2(1-x) = 1, where x is the pounds of apricot jam cookies. Solving for x gives us 0.7 pounds.

Mary Bought Pound of Two Sorts of Cookies for $1