Find the percentage of salt in the solution if 400g of the solution contains 34g of salt.

1. Let’s take 400 g of solution for 100%.

400 = 100%

2. Let’s denote 34 g through x%.

34 = x%

3. Let’s make the proportion.

400 = 100%

34 = x%

4. Let’s solve the proportion.

X = 34 * 100% / 400

X = 8.5%

Answer. The percentage of salt in the solution is 8.5%.

Another option for solving the problem.

The amount of salt in 100 g of solution just shows its percentage in the solution.

If there are 34 g of salt in 400 g of the solution, then in 100 g of the salt solution there will be 34/4 = 8.5 g (we divide the amount of salt by 4, since we are considering the amount of the solution 4 times less than in the condition of the problem).

It follows that the percentage of salt in the solution is 8.5%.