On a weightless lever weights are balanced, the masses of which are equal to 20 kg and 15 kg.

On a weightless lever weights are balanced, the masses of which are equal to 20 kg and 15 kg. The long arm of the lever is 20cm. What is short?

The problem is solved by proportion, the product of the long arm and the smaller mass is equal to the product of the short arm and the larger mass 20 cm = 0.2 m 0.2 m * 15 kg = x m * 20 kg => x = (0.2 * 15) / 20 = 0.15 m = 15 cm
Answer: 15 cm