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 = <<50-12=38>>38 balloons.
We know how long it took Andy to blow up 2 balloons, so 38 balloons / 2 = <<38/2=19>>19 time increments.
We know the time increment is 5 minutes, so 19 x 5 minutes = <<19*5=95>>95 minutes.
#### 95