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The pharmacy has an old scale which has only two measuring weights 30 grams and 5 grams. How can you divide 300 grams of powder medicine into 3 groups, one 150 grams, one 100 and the other 50 grams. You can only weigh 3 times.

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First, we use 300 grams of medicine and 30 gram weight to split 300 medicine into 165 and 135 grams.

Then we use 165 grams of medicine and 30 + 5 gram weights to separate 165 grams into 100 and 65 grams.

Then we further separate the 65 grams into 50 grams and 15 grams.

Finally, Combine 135 and 15 grams to 150 grams.