If the longer side of a rectangle is doubled and the other reduced to half, the area of the new rectangle goes up by - यदि किसी आयत की लम्बी भुजा दो गुना कर दी जाये और दूसरी घटा कर आधी कर दी जाये तो नये आयत का क्षेत्रफल कितना बढ़ जाता है?

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