He acquired Swiss nationality (20) in 1901 and he began working at the Swiss patent office the next year. Correct the following sentence.. in 1901 and A.in 1901 and, B.in 1901, and C,in 1901, and, D.no error I think it is D...?
sum of the digits of a three-digit number is 20. If the hundreds and unit digits were interchanged, the resulting number is 297 less than the original. Find the number if the hundreds digit exceeds the tens digit by one.