5 things cost 10 rupees.
How much do 20 things cost?

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• A 40 rupees
• B 20 rupees
• C 60 rupees
• D 100 rupees

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Answer: A. 40 rupees

1 thing costs 10 / 5 = 2 rupees. So 20 things cost 20 x 2 = 40 rupees.

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