self Maths Puzzle

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???

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self Other Question

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% ) In how many ways can six men and six women be seated in a row, such that two particular women are never together, whereas two particular men are always together?