**(1)** A chemist has a 20% saline solution and a 60% saline solution. How many liters of each solution must be mixed together to make 10 liters of a 40% saline solution?

- (a) 2 liters of 20% and 8 liters of 60%
- (b) 3 liters of 20% and 7 liters of 60%
- (c) 5 liters of 20% and 5 liters of 60%
- (d) 6 liters of 20% and 4 liters of 60%

**(2)** A winemaker has two wines: one that is 12% alcohol and another that is 20% alcohol. How much of each type of wine is needed to make 50 liters of a blend that is 16% alcohol?

- (a) 10 liters of 12% and 40 liters of 20%
- (b) 20 liters of 12% and 30 liters of 20%
- (c) 25 liters of 12% and 25 liters of 20%
- (d) 30 liters of 12% and 20 liters of 20%

**(3)** An alloy A is made by mixing two metals in the ratio 5:3 and alloy B is made by mixing the same metals in the ratio 1:2. If equal quantities of both alloys are melted to form a third alloy C, what will be the ratio of the two metals in alloy C?

- (a) 7:7
- (b) 6:8
- (c) 8:6
- (d) 9:5

**(4)** A trader mixes two types of rice, one costing $3 per kg and the other costing $5 per kg, to create a 10 kg mixture costing $4 per kg. How many kilograms of each type of rice does the trader mix?

- (a) 3 kg of $3 rice and 7 kg of $5 rice
- (b) 5 kg of $3 rice and 5 kg of $5 rice
- (c) 7 kg of $3 rice and 3 kg of $5 rice
- (d) 8 kg of $3 rice and 2 kg of $5 rice

**(5)** A container has 40 liters of milk with 4% fat, and another container has 30 liters of milk with 6% fat. How many liters of each type of milk must be mixed to create a 50-liter mixture with 5% fat?

- (a) 20 liters of 4% fat milk and 30 liters of 6% fat milk
- (b) 24 liters of 4% fat milk and 26 liters of 6% fat milk
- (c) 25 liters of 4% fat milk and 25 liters of 6% fat milk
- (d) 28 liters of 4% fat milk and 22 liters of 6% fat milk