Please help me out! the question is Lin subtracted 3 x 2 then 3 x 1 and lastly 3 x 9 earlier Andre subtracted 3 x 200 and then 3 times 10 and lastly 3 x 9 why did they have the same quotient?

The mean finish time was 185.52 with a standard deviation of 0.327 minute. the winning car driven by chris finished in 185.13. the previous year race had a mean finish time of 110.3 with a standard deviation of 0.106. the winning car that year driven by karen finished in 110.13 minutes. find their respective z-scores. chris - z-score karen “- z-score