A 7 inch diameter pulley is driving a 4 inch pulley. If the 7 inch pulley is turning at 150 rpm what is?

1. A 7 inch diameter pulley is driving a 4 inch pulley. If the 7 inch pulley is turning at 150 rpm what is the speed of the 4 inch pulley? 2. You have a motor turning at 3600 rpm and want to drive another shaft at 550 rpm. If the gear on the motor shaft has 21 teeth, how many teeth must the driven shaft have? 3. A blueprint has a legend that says 3/8 inch = 1 foot. If a room is 3 ft. 9 in by 6.5 inches on the drawing, what is the floor area of the actual room? 4. You need to build a wheelchair ramp to a porch that is 2 ft 4 inches off the ground. The ramp must have a slope of a 1 in 12. How far away from the house must the end of the ramp be?
Answer:

it's all ratios; 1. inverse ratio, 4:7 = 150: x 2. inverse ratio,3600 : 550 = X : 21 3. (That " 3'-9" has got to be wrong) 3/8" = 1' so just count eights for the answer in feet. 4. 1:12 ratio, so multiply 2' 4' (2 1/3) x 12.

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it's all ratios; 1. inverse ratio, 4:7 = 150: x 2. inverse ratio,3600 : 550 = X : 21 3. (That " 3'-9" has got to be wrong) 3/8" = 1' so just count eights for the answer in feet. 4. 1:12 ratio, so multiply 2' 4' (2 1/3) x 12.

Irv S

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