On the way to a family camping weekend, the Estradas stopped at a roadside stand to purchase firewood. The stand sold bundles of pine firewood for $2 per bundle and bundles of hickory firewood for $4 per bundle. The Estradas purchased a total of 25 bundles of pine firewood and hickory firewood for $66. How many bundles of pine firewood did the Estradas purchase?

A.) 8

B.) 11

C.) 17

D.) 21

E.) 22

A.) 8

B.) 11

C.) 17

D.) 21

E.) 22

**p = bundles of pine firewood**

**h = bundles of hickory firewood**

p + h = 25 {they purchased a total of 25 bundles}

2p + 4h = 66 {pine bundles cost $2, hickory bundles cost $4, and the total cost $66}

-4p - 4h = -100 {multiplied top equation by -4}

2p + 4h = 66 {bottom equation stays the same}

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-2p = -34 {added the two equations}

p = 17 {divided each side by -2}

they purchased 17 bundles of pine firewood

**C.)**

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