SSC MTS Model Paper 4

Question : 39 of 150

Marks: +1, -0

Zinc and copper are in the ratio 5 : 3 in 400 gm of an alloy. How much of copper (in grams) should be added in the mixture to make the ratio 5 : 4?

Solution:

In 400 gm of alloy.
Zinc =

5/8

× 400 = 250 gm
Copper =

3/8

× 400 = 150 gm
x gm of copper be mixed, then

250/{150+x}

5/4

⇒ 750 + 5x = 1000
⇒ 5x = 1000 − 750 = 250 ⇒ x = 50 gm

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