Three lorries droved bricks. One drove n bricks at once, second m less bricks than the first and third 300 bricks more the first lorry. The first lorry went 4 times a day the largest went 3 times a day and the smallest 5 times a day.

How many bricks brought:

a / all lorries in one day.
b / all lorries per week / Sunday don't worked /?


a = (Correct answer is: 12n-5m+900) Wrong answer
b = (Correct answer is: 72n-30m+5400) Wrong answer


Solution in text a =
Solution in text b =

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