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A combination of 20 kg of milk and water contains 10% water. Then how much water must be included to this combination to increase the % of water to 25%?

^6kg

5kg

4kg

3kg

Explanation:

-> Some of water in 20 kg of combination is (10/100)*20= 2 kg
-> If “a” kg of water be included with the combination to raise 25% of water
[ (2+a) / (20+a) ] = (25 / 100 )
=> (2 + a ) 100 = 25 (20 + a)
=> 200 + 100a = 500 + 25a
=> 100a – 25a = 500 – 200
=> 75a = 300
A = 4 kg
4 Kg of water is included to this combination.

By: MIRZA SADDAM HUSSAIN

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