Answer:
You have to add up all the numbers then divide them by 3 and you will get your answer:
91+95=186 186+88=274
274÷3=91.333333333 etc.
then you add 90 to 27540
274+90=364
and because there are 4 tests you divide 364 by 4
364÷4=91
Your Answer-91
sorry answer is late!