There is 500 g of a solution containing 40% acid. How much water does it take to add to the solution

There is 500 g of a solution containing 40% acid. How much water does it take to add to the solution to make it 25% acid?

To find the percentage of the number, you need to multiply this number by the desired percentage and divide by 100.

1) Find how many grams of acid in the initial solution:

500 * 40: 100 = 200 (g) – acids.

To find a number by its percentage, you need to multiply this number by 100 and divide by a known percentage.

2) Find the mass of the new solution:

200 * 100: 25 = 800 (g) – the mass of the new solution.

3) Determine how much water needs to be added to the initial solution:

800 – 500 = 300 (g) – water.

Answer: 300 g of water must be added to the solution.