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The answer is 41.
Please refer to the attachment.
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Let, the ones digit be 'x' and tens digit be 'y'
Number=10y+x
Then, y=4x
Interchanging the number
➡️10x+y
Acc to the given question
➡️(10y+x)-(10x+y)=27
➡️10y+x-10x-y=27
➡️9y-9x=27
y=4x
➡️9(4x)-9x=27
➡️36x-9x=27
➡️27x=27
➡️X=1
Then y=4x➡️y=4(1)➡️y=4
Number ➡️10y+x
➡️10(4)+1
➡️40+1
➡️41
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