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A basket weighs 3 red balls. The same basket weighs 5 white balls. If 10 white balls weigh 2.4 kg, what is the weigh of red balls in grams?
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10 white balls weigh 2.4 kg ----> 5 white balls weigh 1.2 kg ----> The basket weighs 1.2 kg ---->
----> 3 red balls weight 1.2 kg ----> one red ball weights = 0.4 kg = 400 grams.
Answer. One red ball weights 400 grams.