We have two soap of equal weights and a 3/4 pound weight.
The balance was equal when we placed one soap on one side and 3/4 pound weight and 3/4th soap on another side.

What is the weight of soap?

Soap Weighing Tricky Maths Brain Teaser

3 lbs.

Explanation:
Based on information provided, we can deduce that
3/4 lbs = 1/4 of soap weight
=> soap weight = 4 x 3/4 = 3 lbs