180 grams of water was added to 620 grams of a 40% salt solution. find the percentage of salt in the new solution.
| June 27, 2021 | education
Determine how many grams of salt was in the initial solution.
We multiply the known weight of the solution by the percentage of salt in it.
620 * 40% = 620 * 0.4 = 248 g.
We find how many grams the solution began to weigh after 180 g of water was added to it.
620 + 180 = 800 grams.
To find out the percentage of salt in the new solution, divide the previously found mass of salt by the weight of the new solution and multiply by 100%.
248/800 * 100% = 24800/800 = 31%.
Answer: 31%.
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