self Maths Puzzle

i wish to fill a 4X4 , 5X5 square so as to make a magic square...
need help with the algo ...

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self Other Question

if man invest 2200 monthly for 15year @9% compound interest then after 15year which amount of money he get. Buffalo gives 4 liter milk, cow gives (1/2) liter milk and goat gives 1/4 liter milk. you have to get 20 liter milk by 20 animals.what is the number of animals?