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
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Correct Answer: 102 kg
Solution : Given, Quantity of A = 135 kg Quantity of B = 72 kg A = Zinc : Copper = 4 : 5 B = Zinc : Copper = 7 : 5 Quantity of Zinc in A = 135 $\times\frac{4}{4+5}$ = 135 $\times\frac49$ = 60 kg And, quantity of Zinc in B = 72 $\times\frac{7}{7+5}$ = 72$\times\frac{7}{12}$ = 42 kg $\therefore$ The weight of the Zinc in the new alloy = 60 + 42 = 102 kg Hence, the correct answer is 42 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 : Alloy X contains 70% copper and 30% zinc. Alloy Y contains 40% copper, 25% zine and 35% aluminium Alloy X and Y are mixed in the ratio of 1 : 3. What is the ratio of copper and zine in the newly formed alloy?
Option 1: 19 : 33
Option 2: 11 : 32
Option 3: 38 : 21
Option 4: 19 : 21
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
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 : An alloy contains a mixture of two metals X and Y in the ratio of 2 : 3. The second alloy contains a mixture of the same metals, X and Y, in the ratio 7 : 3. In what ratio should the first and the second alloys be mixed to make a new alloy containing 50% of metal X?
Option 1: 3 : 4
Option 2: 3 : 1
Option 3: 5 : 6
Option 4: 2 : 1
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