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min yoongi

· started a discussion

· 1 Months ago

wrong answer (Question:233269.0)

i think the correct answer will be 8

Question:

An alloy contains tin, copper and zinc in the ratio of 4 : 6 : 5. Find the quantity of copper to be added to 120 kg of this alloy to form a new alloy in which the ratio of the above elements in the same order is  4 : 8 : 5.

Options:
A) 16 kg
B) 20 kg
C) 10 kg
D) 8 kg
E) None of these
Solution:

Ans: (A) Let the present quantity of tin, copper and zinc in the alloy be 4k, 6k and 5k respectively.

4k + 6k + 5k = 120

K = 8

4k = 32, 6k = 48, 5k = 40

Let the quantity of copper to be added = x

32 : (48 + x) : 40 = 4 : 8 : 5

∴ 32/(48 + x) = 4/8

x = 16

Knowledge Expert

· commented

· 1 Months ago

Dear Student,the correct explanation has been provided.Do re-read it.Keep Learning with Us.
Best Wishes.
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