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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book Other Question

8/b= a+4/a-1 A man row a boat 24 km upstream in 3 hours and returns downstream in 1.5 hour.

(a) Find the speed of the stream
(b) Find the speed of the boat in still water