| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.44 |
| Score | 0% | 69% |
A menswear store is having a sale: "Buy one shirt at full price and get another shirt for 10% off." If Bob buys two shirts, each with a regular price of $23, how much money will he save?
| $4.60 | |
| $6.90 | |
| $11.50 | |
| $2.30 |
By buying two shirts, Bob will save $23 x \( \frac{10}{100} \) = \( \frac{$23 x 10}{100} \) = \( \frac{$230}{100} \) = $2.30 on the second shirt.
How many 9-passenger vans will it take to drive all 71 members of the football team to an away game?
| 8 vans | |
| 15 vans | |
| 7 vans | |
| 4 vans |
Calculate the number of vans needed by dividing the number of people that need transported by the capacity of one van:
vans = \( \frac{71}{9} \) = 7\(\frac{8}{9}\)
So, it will take 7 full vans and one partially full van to transport the entire team making a total of 8 vans.
Which of the following is not a prime number?
7 |
|
9 |
|
5 |
|
2 |
A prime number is an integer greater than 1 that has no factors other than 1 and itself. Examples of prime numbers include 2, 3, 5, 7, and 11.
Which of the following is not an integer?
0 |
|
1 |
|
-1 |
|
\({1 \over 2}\) |
An integer is any whole number, including zero. An integer can be either positive or negative. Examples include -77, -1, 0, 55, 119.
A machine in a factory has an error rate of 8 parts per 100. The machine normally runs 24 hours a day and produces 7 parts per hour. Yesterday the machine was shut down for 9 hours for maintenance.
How many error-free parts did the machine produce yesterday?
| 163.8 | |
| 95.6 | |
| 147.4 | |
| 96.6 |
The hourly error rate for this machine is the error rate in parts per 100 multiplied by the number of parts produced per hour:
\( \frac{8}{100} \) x 7 = \( \frac{8 \times 7}{100} \) = \( \frac{56}{100} \) = 0.56 errors per hour
So, in an average hour, the machine will produce 7 - 0.56 = 6.4399999999999995 error free parts.
The machine ran for 24 - 9 = 15 hours yesterday so you would expect that 15 x 6.4399999999999995 = 96.6 error free parts were produced yesterday.