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दो अंकों से बनी एक संख्या का दहाई का अंक, इकाई के अंक से 5 कम है। यदि अंकों के स्थान बदल दिए जाएँ तो नई संख्या पहली संख्या के दो गुने से 7 अधिक हो जाएगी। वह संख्या बताइए।

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माना संख्या की दहाई का अंक = x तथा इकाई का अंक = y

∴ संख्या = 10x + y

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