set up all proportions from the numbers 21,150,105 and 750
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1st we will make list of fractions and then compare them to make proportions.
1509=503⋯⋯(1)
1059=353⋯⋯(2)
150105=5035=107⋯⋯(3)
1750105=35021=503⋯⋯(4)
1750150=35030=353⋯⋯(5)
From (1) and (4)
1509=1750
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