Bissoy.com
Doctors Medicines MCQs Q&A

If 140 g brass is mixed with copper to prepare an alloy having brass and copper in the ratio 4 : 3, then how much copper has been taken to prepare the alloy?

If 140 g brass is mixed with copper to prepare an alloy having brass and copper in the ratio 4 : 3, then how much copper has been taken to prepare the alloy? Correct Answer 105 g

Given:

Quantity of brass mixed with copper = 140 g

Desired ratio of brass and copper = 4 : 3 

Calculation:

Let the quantity of brass and copper be 4a and 3a respectively. 

4a = 140g 

⇒ a = 140/4 g 

⇒ a = 35 g

∴ The quantity taken of copper to prepare the alloy = 3a = 3 × 35 

⇒ 105 g

Related Questions

An alloy A contains two elements, copper and tin in the ratio of 2 : 3, whereas an alloy B contains the same elements in the ratio of 3 : 4. If 20 kg of alloy A, 28 kg of alloy B and some more pure copper are mixed to form a third alloy C which now contains copper and tin in the ratio of 6 : 7, then what is the quantity of the pure copper mixed in the alloy C?
An alloy A contains two elements, copper and tin in the ratio of 2 ∶ 3, whereas an alloy B contains the same elements in the ratio of 3 ∶ 4. If 20 kg of alloy A, 28 kg of alloy B and some more pure copper are mixed to form a third alloy C which now contains copper and tin in the ratio of 6 ∶ 7, then what is the quantity of the pure copper mixed in the alloy C?
In an alloy, Iron and Copper are mixed in the ratio 7 : 2. In another alloy, these elements are mixed in the ratio 7 : 11. If equal quantities of those alloys are melted to form a third alloy, then what is the ratio of iron and copper in the new alloy?
In two types of brass, the ratios of Copper to Zinc are 8:3 and 15:7 respectively. If the two types of brass be melted and mixed in the ratio 5:2 a new typeof brass is obtained. The ratio of Copper to Zinc in this new type of brass is
Alloy A contains iron and copper in ratio 4 : 5. Alloy B contains iron and copper in ratio 3 : 4. If 45 kg of alloy A and 63 kg of alloy B are mixed, then what is the final ratio of copper and iron?
Two alloys used to manufacture the third alloy. The first alloy contains Copper and Zinc only, and the second alloy contains Aluminium and Copper only. The Copper content in the two alloys is 40% and 60% respectively. The Zinc content in the new alloy should be between 30 to 40%. How much will be the minimum and maximum Copper content in the new alloy?
2 alloys of copper and lead having copper and lead in the ratio 3 : 1 and 5 : 3 respectively, are melted to form a  new alloy A. If the ratio of copper and lead in alloy A is 7 : 10, then find the ratio in which two alloys are mixed to obtain alloy A.
Alloys A and B contain copper and zinc. In alloy A percentage of copper is 25% and in alloy B ratio of copper and zinc is 3 ∶ 5. In what ratio of A and B to be mixed to get a new alloy containing copper and zinc in the ratio 1 ∶ 2?
The ratio of copper and tin in an alloy A is 4 : 5 and that ratio in alloy B is 5 : 4 if the alloys are mixed in the ratio 2 : 3. what is the ratio of copper and tin in mixed alloy.
There are two alloys in the first alloy zinc, copper, and aluminum are in the ratio 3 : 4 : 5, and in the second alloy the ratio of zinc and copper is 1 : 2. If 24 kg of the first alloy and x kg of the second alloy are mixed, the amount of copper in the mixture becomes 20 kg. What is the value of x?