Nate is feeding his livestock hay. Each goat needs 5 pounds, and each sheep needs 3 pounds less than twice the amount each goat needs. If there are 15 goats and 12 sheep, how many pounds of hay does Nate need?
First figure out how much hay each sheep needs: 5 pounds * 2 - 3 = 
<gadget id="calculator">5*2-3</gadget>
<output>7</output>
7 pounds/sheep.
Now figure out how much hay total the sheep need: 7 pounds/sheep * 12 sheep = 
<gadget id="calculator">7*12</gadget>
<output>84</output>
84 pounds.
Now figure out how much hay total the goats need: 5 pounds/goat * 15 goats = 
<gadget id="calculator">5*15</gadget>
<output>75</output>
75 pounds.
Now add the two amounts of hay to find the total: 84 pounds + 75 pounds = 
<gadget id="calculator">84+75</gadget>
<output>159</output>
159 pounds.

<result>159</result>