What is the percentage of copper if the casting weight of copper 42.3 kg and tin weight 2.7 kg

Question

Question : 60 kg of alloy A is mixed with 100 kg of alloy B. If alloy A has lead and tin in the ratio 3 : 2 and alloy B has tin and copper in the ratio 1 : 4, the amount of tin in the new alloy is:
Option 1: 53 kg
Option 2: 44 kg
Option 3: 80 kg
Option 4: 24 kg

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Answer 1

Hi,

Weight of copper = 42.3 kg

Weight of tin = 2.7 kgâ€‹

It means that the net weight of two metals is 42.3 kg + 2.7 kgâ€‹ = 45 kg

The percentage of copper is given by :

% = 42.3/45*100

= 94%

So, the percentage of copper is 94%.

Hope this helps.

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What is the percentage of copper if the casting weight of copper 42.3 kg and tin weight 2.7 kg

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Question : 60 kg of alloy A is mixed with 100 kg of alloy B. If alloy A has lead and tin in the ratio 3 : 2 and alloy B has tin and copper in the ratio 1 : 4, the amount of tin in the new alloy is:
Option 1: 53 kg
Option 2: 44 kg
Option 3: 80 kg
Option 4: 24 kg

Question : The average weight of 40 children in a class is 36.2 kg. When three more children of weights 42.3 kg, 39.7 kg, and 39.5 kg join the class, the average weight of the 43 children in the class is:
Option 1: 39.2 kg
Option 2: 36.5 kg
Option 3: 38.35 kg
Option 4: 37.3 kg

Question : The average weight of R, P, and K is 40 kg. If the average weight of P and K is 45 kg and the average weight of R and K is 35 kg, then what is the weight of K?
Option 1: 40 kg
Option 2: 70 kg
Option 3: 90 kg
Option 4: 120 kg

Question : The average weight of A, B, and C is 40 kg. If the average weight of A and B is 35 kg and that of B and C is 31 kg, then what is the weight of B?
Option 1: 12 kg
Option 2: 50 kg
Option 3: 24 kg
Option 4: 36 kg

Question : The average weight of Shubha, Govinda, and Reshma is 65 kg. If the average weight of Shubha and Govinda is 63 kg and that of Govinda and Reshma is 70 kg, then the weight of Govinda is:
Option 1: 41 kg
Option 2: 71 kg
Option 3: 88 kg
Option 4: 46 kg