Question

An alloy of copper and zinc contains 82% copper. After 18 kg of zinc had been added to
the alloy, the copper content gets reduced to 70%. How much copper and zinc does the
new alloy contain?

(1) Copper 88 kg, zinc 35 kg
(2) Copper 86.1 kg, zinc 36.9 kg
(3) Copper 80.5 kg, zinc 42.5 kg
(4) Copper 70 kg, zinc 30 kg​

Answer 1

Answer:

The answer be option 4

Step-by-step explanation:

First it contain 82 % coper ..so alloy must have 18% zinc

After adding 18kg zinc .. coper deduced to 7O%

Now Zinc = (1OO - 7O)% is 3O%

So coper 7O%,zinc3O%