Question

In a certain school, course grades range from 0 to 100. Adrianna took 4 courses and her average course grade was 90. Roberto took 5 courses. If both students have the same sum of course grades, what was Roberto's average?

Answer 1

Answer: Average if 9 courses is 40.

Step-by-step explanation:

Since we have given that

Number of courses = 4

Average of 4 courses = 90

We need to find the average of 9 courses.

Let the average of 9 courses be x.

According to the question, we get that

4 × 90 = 9 × x

360 = 9x

x = 360 ÷ 9

x = 40

Hence, average if 9 courses is 40.

Answer 2

72, because 360/4 courses = 90 as an average for Adrianna. This means that 360/5 courses equals 72 for roberto.