A student earned a grade of 60% on a math test that had 30 problems. How many problems on this test did the student answer corre
1 answer:
Answer:
The student answered 18 problem correctly.
Step-by-step explanation:
We can find the number of problems answered correctly out of a test that had 30 problems by setting up equivalent fractions, or a proportion:
'x' is equal to the number of problems answered correctly. Since 60% is the number answered correctly and 100% is the total amount, we can compare 60% to 'x' and 100% to 30. In order to solve for 'x', we can cross-multiply and divide:
100x = (60)(3) or 100x = 180
Divide both sides by 100:
x = 18
You might be interested in
Using a linear function, it is found that the algebraic expression that shows the amount Ms. Jackson will pay for the small truck for the week is:
- A linear function is modeled by:
In which:
- a is the slope, which is the rate of change, that is, by how much y changes when x changes by 1.
- b is the y-intercept, which is the value of y when x = 0.
In this problem:
- He pays an amount per mile, plus a flat weekly fee.
- Researching the problem on the internet, it is found that the weekly fee for the small truck is of $340, hence
.
- For each mile, he pays $0.6, hence the slope is of
.
Then, the expression is:
To learn more about linear function, you can take a look at brainly.com/question/25823744