The FanMath brain teasers require computations to solve.
Joe Bob just installed a fan system to cool off from the summer heat. The fan spins at a maximum speed of 40 mph and is controlled by a 360 degree turning knob. Assuming the fan is spinning at 15 mph, how much would the knob have to be turned in order to go at a constant speed of 25 mph?
You want to increase the speed by 10 mph, which is 1/4 of the total scale (10 mph divided by 40 mph). To do this you need to adjust the knob 1/4 of its total range.
1/4 of 360 degrees is 90 degrees.
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