Fresh dates contain 90% water while dry dates contain 28% water . How many kg of dry dates can be obtained from 36kg of fresh dates ?
C. 12 Kg
Responding to a pm:
Personally, I would use the method used by Bunuel above. But if you insist on using the "alligation method" which we call "scale method", here is how you can do it:
What two things are mixed to give the third?
Dry dates are mixed with water to give fresh dates.
Dry dates have 28% water, water is 100% water and fresh dates have 90% water.
Dry dates/water = w1/w2 = (A2 - Aavg)/(Aavg - A1) = (100 - 90)/(90 - 28) = 10/62 = 5/31
Mixing 5 kg of dry dates with 31 kg (to maintain consistency) of water will give you 36 kg of fresh dates.
Answer 5 kg
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