Final answer:
To make a 2% salt solution using the same amount of salt in a 3% solution, we find the mass of the salt (21 grams) and divide it by 0.02, resulting in 1050 grams of a 2% salt solution.
Step-by-step explanation:
Arush made 700 grams of 3% salt solution. To calculate how much 2% salt solution he can make with the same amount of salt, we first need to find out the mass of the salt in the original solution. A 3% salt solution means that 3% of the total mass is salt. Therefore, Arush's solution contains 21 grams of salt (700 grams x 3%).
To make a 2% salt solution, the amount of salt (21 grams) will remain constant, so we need to calculate the total mass of the solution that would result in 2% being salt. We can do this by dividing the mass of the salt by the percentage in decimal form:
Mass of solution = Mass of salt / Percent of salt in decimal form
Mass of solution = 21 grams / 0.02 = 1050 grams of 2% salt solution.