Question

6. Two metals have their total weight equivalent to 60 kg. The first metal contains 10 kg of pure copper and the second contains 8 kg of pure copper. What is the percentage of copper in the first metal, if second metal contains 15% more copper than the first? (a) 25% (b) 22% (c) 17% (d) 20%​

Answer 1

Answer:

Correct option is

B

25%

Let first and second piece of bronze be = xkg,(60−x)kg

60−x

8

−

x

10

=

100

15

x(60−x)

8x−600+10x

=

20

3

3x

2

+180x−12000=0

x=40%=

40

10

×100=25%