Alligation or Mixture problems
A shopkeeper has 50 kgs of rice. He sells a part of it at 20% profit and the rest at 40% profit. If he gains 25% on the whole, find the quantity of each part.

37.5 kgs and 12.5 kgs
21.5 kgs and 23.5 kgs
23.5 kgs and 21.5 kgs
12.5 kgs and 37.5 kgs

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