a large cogwheel contains 117 cogs, and a small one contains 52 cogs.if the large wheel revolves 20 times,find the amount of revolutions of the small wheel.

Rev. = 20*(117/52) = 45.

Haha Mr.Don needs help aswell..

To find the amount of revolutions of the small wheel, we need to find the ratio between the number of cogs on the large wheel and the number of cogs on the small wheel.

The ratio can be calculated as follows:
Ratio = Number of cogs on the large wheel / Number of cogs on the small wheel

Let's calculate the ratio:
Ratio = 117 cogs / 52 cogs
Ratio = 2.25

This means that for every 2.25 revolutions of the large wheel, the small wheel completes one revolution.

Since the large wheel revolves 20 times, we can now find the amount of revolutions of the small wheel:
Amount of revolutions of the small wheel = 20 revolutions of the large wheel / 2.25 (ratio)

Calculating this:
Amount of revolutions of the small wheel = 20 / 2.25
Amount of revolutions of the small wheel ≈ 8.89

Therefore, the small wheel will complete approximately 8.89 revolutions when the large wheel revolves 20 times.