Question

PLEASE HELP PLEASE HELP PLEASEEEE

Answer 1

27. C

28. D

Explanation:

The average of all grades in his fencing class, including the upcoming one, (all grades summed up divided by the amount of grades) must be equal to 86 (percent), hence C is the right answer for 27.

Solving this equation gives:

`(75+88+62+100+x)/(5) = 86\\325 + x = 86 \cdot 5\\x = 430 - 325 = 105`

So D is the right answer for 28.