1241 divided by 43 what is the answer and work

Ricardo ran the 400 meter race 3 times his fastest time was 54.3 seconds his slowest time was 56.1 seconds if his average time was 55.0 seconds what was his time for the third race

The sum of two numbers is 86, and their difference is 20. find the two numbers

If g^-1(x) is the inverse of g (x) which statement must be true