Step-by-step explanation:
?×4-18=94
(28)×4-18=94 I'm just trying
We conclude that the starting average grade is 79.17%
<h3>
How to write the equation and solve it?</h3>
There are 50 students, let's say that the grades are measured between 1% and 100%.
And the average grade of the 50 students is A.
We know that after it increased by 20%, the average of the grades is 95.
Then we just need to solve the percentage equation:
95 = A*(1 + 20%/100%) = A*(1.2)
95/1.2 = A = 79.17
We conclude that the starting average grade is 79.17%
If you want to learn more about percentages:
brainly.com/question/843074
#SPJ1
Answer:
36, 180
Step-by-step explanation:
x = y/5, so y = 5x
y - x = 144
5x - x = 144
4x = 144
x = 144/4 = 36
y = 5x = 5*36 = 180
The two numbers are 36 and 180
Likely
6000 hours is over the mean average, but it is not impossible that it will not happen.
Answer:
64 units
Step-by-step explanation:
divide the shape into two shapes:
first one: 15+15+4+4=38
second shape:7+7+6+6=26
pweimwter for the whole shape: 38+26=64 units
