Discuss Forum
1.
Solution X contains 40% salt and 60% water by weights, Solution Y contains 25% salt and 75% water. If a mixture of X and Y contains 30% salt. What percent of the weight of this mixture is solution X?
- A. 10%
- B. 10%
- C. 10%
- D. 10%
Answer: Option B
Explanation:
Let x g be the weight of solution X in 100 g of the mixture.
Then, the weight of solution Y in 100 g of the mixture = (100 - x) g
Mass of salt in the mixture:
x (40%) + (100 - x) (25%) = 100 (30%)
40x + 2500 - 25x = 3000
15x = 500
x = 33 1/3
Hence, there are (33 1/3)% of solution X in the mixture.
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