| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.15 |
| Score | 0% | 63% |
A machine in a factory has an error rate of 3 parts per 100. The machine normally runs 24 hours a day and produces 9 parts per hour. Yesterday the machine was shut down for 9 hours for maintenance.
How many error-free parts did the machine produce yesterday?
| 131 | |
| 153.6 | |
| 140.8 | |
| 143.2 |
The hourly error rate for this machine is the error rate in parts per 100 multiplied by the number of parts produced per hour:
\( \frac{3}{100} \) x 9 = \( \frac{3 \times 9}{100} \) = \( \frac{27}{100} \) = 0.27 errors per hour
So, in an average hour, the machine will produce 9 - 0.27 = 8.73 error free parts.
The machine ran for 24 - 9 = 15 hours yesterday so you would expect that 15 x 8.73 = 131 error free parts were produced yesterday.
Which of the following is not an integer?
\({1 \over 2}\) |
|
1 |
|
-1 |
|
0 |
An integer is any whole number, including zero. An integer can be either positive or negative. Examples include -77, -1, 0, 55, 119.
Charlie loaned Ezra $1,000 at an annual interest rate of 9%. If no payments are made, what is the interest owed on this loan at the end of the first year?
| $45 | |
| $4 | |
| $90 | |
| $30 |
The yearly interest charged on this loan is the annual interest rate multiplied by the amount borrowed:
interest = annual interest rate x loan amount
i = (\( \frac{6}{100} \)) x $1,000
i = 0.09 x $1,000
i = $90
If a mayor is elected with 58% of the votes cast and 47% of a town's 50,000 voters cast a vote, how many votes did the mayor receive?
| 13,395 | |
| 20,680 | |
| 17,155 | |
| 13,630 |
If 47% of the town's 50,000 voters cast ballots the number of votes cast is:
(\( \frac{47}{100} \)) x 50,000 = \( \frac{2,350,000}{100} \) = 23,500
The mayor got 58% of the votes cast which is:
(\( \frac{58}{100} \)) x 23,500 = \( \frac{1,363,000}{100} \) = 13,630 votes.
A bread recipe calls for 3\(\frac{3}{4}\) cups of flour. If you only have 1 cup, how much more flour is needed?
| 1\(\frac{1}{2}\) cups | |
| 2\(\frac{3}{4}\) cups | |
| 1 cups | |
| 1\(\frac{3}{4}\) cups |
The amount of flour you need is (3\(\frac{3}{4}\) - 1) cups. Rewrite the quantities so they share a common denominator and subtract:
(\( \frac{30}{8} \) - \( \frac{8}{8} \)) cups
\( \frac{22}{8} \) cups
2\(\frac{3}{4}\) cups