Answer:
30
Step-by-step explanation:
To calculate the average you add up all the scores and divide by the number of scores (5)
add all the current test scores and allow X to be the unknown score:
92+80+88+93+X: or 353 + X
set up equation:
(353+X)
______ = 90
5
Multiply both side of the equation by 5 to clear the fraction resulting in:
353+X=450
Subtract 353 from both sides of the equation:
x = 97
So the test score needed to get a 90 average is 97.
Answer:
27/4 = 6.75
The final envelope will only contain 3 checks
Remember distance divided by time so 105/90 =1.17
1694/4 = 423,5
Answer: 423,5 hours.
