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दो अंकों वाली किसी संख्या के अंकों का योगफल 9 है। दी हुई संख्या के अंकों के क्रम को उलट देने पर प्राप्त हुई मूल संख्या से 27 अधिक है। मूल संख्या ज्ञात कीजिए।

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माना  इकाई का अंक = y

और , दहाई का अंक = x

तथा , अंकों का क्रम उलट देने पर प्राप्त नई संख्या = 10y + x

⇒ x +y = 9              .....(1)

तथा , (10y + x) - (10x + y) = 27

⇒ 10y + x - 10x - y = 27

⇒ -9x + 9y = 27

⇒ x - y = -3           ......(2)

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