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दो अंकों की एक संख्या का इकाई का अंक दहाई के अंक से 1 अधिक है। यदि संख्या अंकों के जोड़ के 5 गुने से 3 अधिक हो, तो वह संख्या बताइए।

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

∴ संख्या = 10x + y

⇒ y = x +1        ......(1)

तथा 10x + y = 5(x + y) + 3

समीकरण (1) से y का मान  समीकरण (2) में रखने पर,

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