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 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

The answer is o. 68 not 0.67