GMAT Exam Numerical Ability Ratio and Proportion

In 1 kg mixture of sand and iron, 20% is iron. How much sand should be added so that the proportion of iron becomes 10%

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Ans=1 kg

Quantity of iron in 1 kg= 1*(20/100)= 0.2 kg
Let 'x' kg of sand is added so that iron is 10% in a mixture, then 0.2/(1+x) = 10/100
=> 1+x= 2 or x=1
7 years agoHelpfull: Yes(2) No(0)

in 1 kg... 800 gm is sand and 200 gm is iron. now 200 gm is 10% of 2Kg so we need 1 Kg of sand to make it 9:1 ratio for sand and iron
7 years agoHelpfull: Yes(0) No(1)

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