You make candles and sell them for 15 dollars each. The material to make up to 20 candles costs 20 dollars. How many candles must you sell to have a profit of 85 dollars?
<gadget id="calculator">85 + 20</gadget>
<output>105</output>

<gadget id="calculator">105 / 15</gadget>
<output>7</output>

<result>7</result>