book Maths Puzzle Numerical Ability

how much water must be added to 12 grams of 90% iodine solution to produce a 25% iodine solution?

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a rectangular pigpen is bordered on one side by a barn and on the other sides by 575m of fencing. find the dimensions of the pigpen if its area is a maximum? Im need help for the Distributive Property!!! I need help despretely!!!
And...can u make it easy...my algebra teacher is not very bright!!!:)



Sincerely,

Im failing in A