1.

A number consists of two digits whose sum is 9. If 27 is subtracted from the number its digits are reversed. Find the number.​

Answer»

-STEP EXPLANATION:LET the NUMBER =ab=10a+bSum of DIGITS =9a+b=9number −27=number with reversrd digits10a+b−27=10b+a9(a−b)=27a−b=3(a+b)+(a−b)=9+3⇒a=6,b=3∴ Required number is 63



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