| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.14 |
| Score | 0% | 63% |
If there were a total of 150 raffle tickets sold and you bought 3 tickets, what's the probability that you'll win the raffle?
| 11% | |
| 6% | |
| 2% | |
| 9% |
You have 3 out of the total of 150 raffle tickets sold so you have a (\( \frac{3}{150} \)) x 100 = \( \frac{3 \times 100}{150} \) = \( \frac{300}{150} \) = 2% chance to win the raffle.
What is the greatest common factor of 56 and 64?
| 37 | |
| 48 | |
| 46 | |
| 8 |
The factors of 56 are [1, 2, 4, 7, 8, 14, 28, 56] and the factors of 64 are [1, 2, 4, 8, 16, 32, 64]. They share 4 factors [1, 2, 4, 8] making 8 the greatest factor 56 and 64 have in common.
A circular logo is enlarged to fit the lid of a jar. The new diameter is 45% larger than the original. By what percentage has the area of the logo increased?
| 15% | |
| 30% | |
| 20% | |
| 22\(\frac{1}{2}\)% |
The area of a circle is given by the formula A = πr2 where r is the radius of the circle. The radius of a circle is its diameter divided by two so A = π(\( \frac{d}{2} \))2. If the diameter of the logo increases by 45% the radius (and, consequently, the total area) increases by \( \frac{45\text{%}}{2} \) = 22\(\frac{1}{2}\)%
Which of the following is not a prime number?
2 |
|
7 |
|
5 |
|
9 |
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.
What is \( \frac{4}{3} \) + \( \frac{7}{9} \)?
| 2\(\frac{1}{9}\) | |
| \( \frac{4}{9} \) | |
| \( \frac{1}{9} \) | |
| 2 \( \frac{1}{9} \) |
To add these fractions, first find the lowest common multiple of their denominators. The first few multiples of 3 are [3, 6, 9, 12, 15, 18, 21, 24, 27, 30] and the first few multiples of 9 are [9, 18, 27, 36, 45, 54, 63, 72, 81, 90]. The first few multiples they share are [9, 18, 27, 36, 45] making 9 the smallest multiple 3 and 9 share.
Next, convert the fractions so each denominator equals the lowest common multiple:
\( \frac{4 x 3}{3 x 3} \) + \( \frac{7 x 1}{9 x 1} \)
\( \frac{12}{9} \) + \( \frac{7}{9} \)
Now, because the fractions share a common denominator, you can add them:
\( \frac{12 + 7}{9} \) = \( \frac{19}{9} \) = 2\(\frac{1}{9}\)