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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