GRE Exam Numerical Ability Alligation or Mixture

a merchant mixes three varieties of rice costing rs20/kg ,rs24/kg and rs30/kg and sells the mixture at a profit of 20% and rs30/kg how many kgs of the second vareity will be in the mixture if 2kgs of the third variety is there in the mixture?

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ans=10 not 5
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GRE Other Question

a merchant marks his goods up by 60% and then offers a discount on the marked price if the final price after the discount results in the merchant making no profit or loss what was % dicount offered by the merchant? a trader claims to sell his goods at a loss of 8% but weighs 900gms in place of kg weight find the real loss or gain percent?