Jack collects all his neighbors' recycling and sorts out the cans and bottles to return for the deposit. He gets 10 cents per bottle and 5 cents per can. If he recycled 80 bottles and made $15, how many cans did he recycle?
First find the total amount Jack earned from the bottles: $0.10/bottle * 80 bottles = $
<gadget id="calculator">0.10*80</gadget>
<output>8</output>
8.00.
Then subtract that amount from his total earnings to find the amount he earned from cans: $15.00 - $8.00 = $
<gadget id="calculator">15-8</gadget>
<output>7</output>
7.00.
Then divide his total earnings from cans by his earnings per can to find the number of cans he recycled: $7.00 / $0.05/can = 
<gadget id="calculator">7/0.05</gadget>
<output>140</output>
140 cans.

<result>140</result>