self Maths Puzzle

A mixture of spirit and water measure 80 litres. It contains 20% water. How much water should be added to it so that water may be 25%

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self Other Question

A mixture of milk and water measures 60 litres. It contains 20% water. How many litres of water should be added to it so that water may be 25%? if two sides of a triangle are 4cm and 20cm and the third side is also an integer then how many such triangles are possible???