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Question
If the cost of 3 books is ₹ 90, then find the cost of 12 books.
Options
₹ 300
₹ 320
₹ 360
₹ 400
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Solution
₹ 360
Explanation;
Hint: `3/90 = 12/x`
⇒ x = `(12 xx 90)/3`
= 360
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