Alligation or Mixture problems
In a triangle XYZ , which of the following conditions is true

XY + YZ < ZX
XY YZ < XZ
XY YZ > ZX
XY + ZX < YZ

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Alligation or Mixture problems
A man pays Rs. 6.40 per litre of milk. He adds water and sells the mixture at Rs. 8 per litre, thereby making 37.5% profit. The proportion of water to milk received by the customers is

9 : 11
10 : 1
1 : 10
11 : 9

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Alligation or Mixture problems
From a container, 6 liters milk was drawn out and was replaced by water. Again 6 liters of mixture was drawn out and was replaced by the water. Thus the quantity of milk and water in the container after these two operations is 9:16. The quantity of mixture is:

25
16
15
31

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