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Question
Write the mean and extreme terms in the following ratios and check whether they are in proportion.
78 litre is to 130 litre and 12 bottles is to 20 bottles
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Solution
78 : 130, 12 : 20
Product of the means = 78 × 20
= 1560
Product of the extremes = 130 × 12
= 1560
a × d = b × c
∴ They are in proportion
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