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Mathematics

2 answers:

icang [17]3 years ago

7 0

27 is c And 28 is d.

Delvig [45]3 years ago

5 0

Answer:

27. C

28. D

Step-by-step 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:

$\frac{75+88+62+100+x}{5} = 86\\325 + x = 86 \cdot 5\\x = 430 - 325 = 105$

So D is the right answer for 28.

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Answer:

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