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1) if a patient weighing 70kg requires 210mg of this medicine, then what is the amount of medicine requires for a patient weighing 80kg?

2) a boy makes a journey in two parts,he can either walk at 3m/s or jog 4m/s.he takes 110 seconds. if he walks the first part and jogs the second, he takes 100 seconds. find the lengrhs of the two parts of the journey.

3) a fish can swim at 14m/s with the current and 6m/s against the current. find the speed of the current and the fish in still water.

4) solve the following sustem of linear equations

21/2x + 12/y = 3/2

21/2x + 33/2y = -27/2

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