Question

Adnan bought

pounds of apples for $0.72 per pound and
pounds of bananas for $1.60 per pound.

Answer 1

a%2Bb=12 [1]

.75a%2B1.05b=10.20 [2]

Use elimination: multiply the first equation by .75 and then compare the two equations (i.e., subtract one equation from the other):

.75a%2B.75b=9

.75a%2B1.05b=10.2

.3b=1.2

3b=12

b=4

ANSWER: He bought 4 pounds of bananas, which means 8 pounds of apples.

CHECK: 8($.75)+4($1.05) = $6+$4.20 = $10.20