So, I have 3 questions I need help with that I don't really understand 1. In an alloy, copper and zinc are mixed in the ratio 5:3 by weight. If the weight of a block of the alloy is 4.8kg, find the weight of copper in it.

2. The numbers of clerical and technical staff in a company are in the ratio 2:5. If the total number of staff in the company is 28, how many of them are technical staff?

3. In a solution, water and alcohol are mixed in the ratio 4:1 by volume. Find the amount of alcohol in 750 cubic centimeters of the solution.

Will give brainliest for the correct answer, thanks for the help!