Others Maths Puzzle

A food processing unit receivd fresh 'a' kg berries.aftr analysis,these berries wre found 2 cntain 99% water.Aftr 15 days same lot ws found 2 contain 98% water.what must b d weight of lot of berries nw?

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Others Other Question
. A sum at simple interest at 13 ½ % per annum amounts to Rs.2502.50 after 4 years. Find the sum. x*y=x^2 y^2 xy 1
then (1*2)*3=?