A number theory problem by sudoku subbu

Number Theory Level pending

rama was asked by her teacher to subract 3 from a certain number and then divide the result by 9. instead she subracted 9 and then divided the reult by 3. she got 43 as answer. what would have been her answer if she had solved the problem correctly


The answer is 15.

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1 solution

Parveen Soni
Dec 5, 2014

going reverse we have certain no.=(43x3)+9=138 now applying operations correctly we have (138-3)/9=15

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