Final answer:
To find how much salt is in a 700g 3% salt solution, multiply the total mass by 3%, resulting in 21 grams of salt.
Step-by-step explanation:
Calculating the Amount of Salt in a Solution
To determine how much salt Arush used to make a 700g 3% salt solution, we need to calculate 3% of the total mass of the solution. The calculation is as follows:
700g (total mass of the solution) × 0.03 (3% as a decimal) = 21g of salt
Therefore, the amount of salt Arush used is 21 grams.