Ashley had already blown up 12 balloons for the party when Andy took over and started blowing them up at a rate of 2 every five minutes. When Andy stopped, there were 50 balloons. For how many minutes did Andy blow up balloons?
Andy blew up 50 balloons - the 12 balloons Ashley blew up = 
<gadget id="calculator">50-12</gadget>
<output>38</output>
38 balloons.
We know how long it took Andy to blow up 2 balloons, so 38 balloons / 2 = 
<gadget id="calculator">38/2</gadget>
<output>19</output>
19 time increments.
We know the time increment is 5 minutes, so 19 x 5 minutes = 
<gadget id="calculator">19*5</gadget>
<output>95</output>
95 minutes.

<result>95</result>