Question : The ratio of copper and zinc in brass is 7 : 3. How much amount of copper will be there in 200 kg of brass?
Option 1: 60 kg
Option 2: 120 kg
Option 3: 160 kg
Option 4: 140 kg
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Correct Answer: 140 kg
Solution : The total parts in the ratio = 7 + 3 = 10 ⇒ Copper in the ratio = $\frac{7}{10}$ ⇒ Amount of copper = $\frac{7} {10}×$ total weight of brass ⇒ Amount of copper = $\frac{7} {10}×$ 200 = 140 kg Hence, the correct answer is 140 kg.
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Question : An alloy contains copper, zinc, and nickel in the ratio of 3 : 2 : 5 respectively. What quantity of nickel (in kg) must be added to 100 kg of this alloy to have the new ratio of copper, zinc, and nickel 3 : 2 : 6 respectively?
Option 1: 20 kg
Option 2: 10 kg
Option 3: 8 kg
Option 4: 15 kg
Question : 135 kg of alloy A is mixed with 72 kg of alloy B to get a new alloy. If alloy A has zinc and copper in the ratio 4 : 5 and alloy B has zinc and copper in the ratio 7 : 5, then what is the weight of zinc in the new alloy?
Option 1: 102 kg
Option 2: 115 kg
Option 3: 85 kg
Option 4: 92 kg
Question : Brass is an alloy of
Option 1: lead and tin
Option 2: zinc and copper
Option 3: antimony, tin and lead
Option 4: zinc, tin and copper
Question : In a mixture, water and milk are in the ratio of 2 : 3. What is the amount of water that is to be added to 20 kg of this mixture to make the ratio of water and milk in the new mixture 1 : 1?
Option 1: 3 kg
Option 2: 2 kg
Option 3: 4 kg
Option 4: 5 kg
Question : In what ratio must tea at Rs. 58 per kg be mixed with tea at Rs. 64 per kg so that the mixture must be worth Rs. 60 per kg?
Option 1: 2 : 3
Option 2: 2 : 1
Option 3: 1 : 2
Option 4: 3 : 2
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