An alloy contains 89% of copper; find how much copper is

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An alloy contains 89% of copper; find how much copper is to be mixed to a sample of alloy so as to get 44 kg of a new metal having 90% copper in it.

1. 2 kg
2. 3 kg
3. 2.5 kg
4. 4 kg

Correct Option: D

In 100 gm of alloy, Copper = 89 gm.
Let x gm. of copper be mixed

	789 + x	=	90
	11		10

⇒ x = 99 – 89 = 10gm
To get 44 kg of new alloy, copper to be mixed

=	44 × 1000 × 100	= 4 kg.
	1100