Q13. In a two-digit number, the sum of its digits is 10. If 15 is added to four times the number gives the number by reversing the digits of original number, then find the original number.
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ans is 150
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Step-by-step explanation:
x+y=10
y=10-x
original number=10x+10-x
=9x+10
after interchanging=100-10x+x
=100-9x
A.T.Q
36x+65=100-9x
×=1
y=10-x
10-1=9
hence the original no.is 19
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