general Maths Puzzle

Jamil can fill a pool carrying buckets of water in 36 minutes. Sue can do
the same job in 65 minutes. Tony can do the same job in 1 and half hours. How
quickly can all three fill the pool together?

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general Other Question

In his pocket, a boy has 3 red marbles, 4 blue marbles, and 5 green
marbles. How many will he have to take out of his pocket to ensure that he
has taken out at least one of each color?
405 135 54 29 18 18 9

Explain why