Question

Melisa can buy a 8 pound bag of dog food for $7.20. Which bag has an equivalent cost?The options are 5 pounds for $5.006 pound bag for 5.402 pound bag for 3.503 pound bag for 2.80

Answer 1

6 pounds bag for $5.40

1) Considering that an eight lbs bag is $7.2, then we can write out the following:

$\frac{7.2}{8}=0.9$

2) So 1 lb of dog food is $0.90. Then examining the options, we can state that the equivalent cost is found at:

$6\times0.9=5.40$

Note that we only had to multiply the number of pounds by the unit ratio.

3) Hence, the answer is

6 pound bag for $5.40