book Maths Puzzle Numerical Ability

how do i work out 3% solution from a 6% solution of 1.5ml hydrogen peroxide solution?

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how do i do this problem, step by step 4(x+8)<6x+20 Solve the problem:

The printed matter on a 12 by 18 centimeter page of a book must cover 40 square centimeters. If all margins are to be the same width, how wide should the margins be?