दो अंकों से बनी संख्या के अंको का योग 9 है । यदि संख्या के अंको को उल्टा कर दिया जाय तो प्राप्त संख्या मूल संख्या से 45 अधिक हो ।
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Step-by-step explanation:
if first number is X and second number is Y
Y + X = 9 ------- equation 1
by second sentence
10Y + X = 10X + Y + 45
9Y - 9X = 45
Y - X = 5 ------- equation 2
equation 1 + equation 2
Y + X = 9
Y - X = 5
=========
2Y = 14
Y = 7
=====================
put the value of Y in equation 2
Y - X = 5
7 - X = 5
X = 7 - 5
X = 2
so the two digit number is 27
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