Mariela bought 15 pounds of birdseed for $10.00. Mark bought 12 pounds of birdseed for $8.00. Daryl bought 18 pounds of birdseed for $12.00. If the cost per pound remains the same, what should be the cost of one pound of birdseed?

The answer is o. 68 not 0.67

The cost for one pound of birdseed is $0.67

Step-by-step explanation:

Use Mariela's example first

To find the cost per pound, get the pounds to 1.

15 pounds = $10.00 Divide both sides by 15 to get 1 pound

1 pound = $0.67

Use Mark's example to see if it is the same rate

12 pounds = $8.00 Divide both sides by 12 pounds to get one pound

1 pound = $0.67

Use Daryl's example to prove the other answers

18 pounds = $12.00 Divide both sides by 8 pounds to get one pound

1 pound = $0.67