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10 Dec 2020, 07:45
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68% (02:11) correct
32%
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An alloy contains zinc, copper and tin in the ratio 2:3:1 and another contains copper, tin and lead in the ratio 5:4:3. If equal weights of both alloys are melted together to form a third alloy, then the weight of lead per kg in new alloy will be:
A. 1/10 kg
B. 1/8 kg
C. 1/6 kg
D. 1/4 kg
E. 1/2 kg
A. 1/10 kg
B. 1/8 kg
C. 1/6 kg
D. 1/4 kg
E. 1/2 kg
10 Dec 2020, 08:56
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Ans is 1 / 8 as if we mix in equal proportions the % becomes half of combined both
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19 Dec 2020, 03:21
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2+3+1=6 -> 2*6=12
5+4+3=12
In order to have both alloys in same proportion, we need 2 kgs of 1st for every 1kg of 2nd:
Proportion of Lead = (0+3)/(2*6+12)= 3/24= 1/8 => C
5+4+3=12
In order to have both alloys in same proportion, we need 2 kgs of 1st for every 1kg of 2nd:
Proportion of Lead = (0+3)/(2*6+12)= 3/24= 1/8 => C
