book Maths Puzzle Numerical Ability

my questions is
solve m+9.35=2.73

my answer is m=-6.62
thanks for the help

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book Other Question

245 divided by 15=.............16 1/3, 15r.5, 16.2 or .06 r.30? thank you very much!!!!!!!!!!! Please help me to find a genral rule for calculating the sum of angles for any n- sided polygon...
Help its homework and needed by Sunday the 16th of October
Cheers,