There are ___ radial arms that are 100 mils apart on an OF fan.

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Multiple Choice

There are ___ radial arms that are 100 mils apart on an OF fan.

Explanation:
Radial arms on an OF fan are placed at a fixed mil spacing, so the total span from the first arm to the last equals the number of gaps between arms times the spacing. If the fan spans 1600 mils and the arms are 100 mils apart, there are 1600/100 = 16 gaps. Those 16 gaps connect 17 arms, since there is one more arm than there are gaps. So there are 17 radial arms. If you used fewer arms, the span would be smaller (14 gaps for 15 arms = 1400 mils; 15 gaps for 16 arms = 1500 mils). If you used more arms, the span would be larger (17 gaps for 18 arms = 1700 mils).

Radial arms on an OF fan are placed at a fixed mil spacing, so the total span from the first arm to the last equals the number of gaps between arms times the spacing. If the fan spans 1600 mils and the arms are 100 mils apart, there are 1600/100 = 16 gaps. Those 16 gaps connect 17 arms, since there is one more arm than there are gaps. So there are 17 radial arms. If you used fewer arms, the span would be smaller (14 gaps for 15 arms = 1400 mils; 15 gaps for 16 arms = 1500 mils). If you used more arms, the span would be larger (17 gaps for 18 arms = 1700 mils).

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