Check whether 21,16, 35, 10 are in proportion
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https://www.meritnation.com/ask-answer/question/how-do-u-find-if-the-following-numbers-are-in-proportion-a/ratio-and-proportion/3706002
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https://www.meritnation.com/ask-answer/question/how-do-u-find-if-the-following-numbers-are-in-proportion-a/ratio-and-proportion/3706002
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