| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.08 |
| Score | 0% | 62% |
Which of these numbers is a factor of 48?
| 25 | |
| 2 | |
| 13 | |
| 12 |
The factors of a number are all positive integers that divide evenly into the number. The factors of 48 are 1, 2, 3, 4, 6, 8, 12, 16, 24, 48.
What is \( \frac{7}{6} \) - \( \frac{4}{10} \)?
| 2 \( \frac{9}{30} \) | |
| \( \frac{4}{13} \) | |
| \(\frac{23}{30}\) | |
| 1 \( \frac{4}{30} \) |
To subtract these fractions, first find the lowest common multiple of their denominators. The first few multiples of 6 are [6, 12, 18, 24, 30, 36, 42, 48, 54, 60] and the first few multiples of 10 are [10, 20, 30, 40, 50, 60, 70, 80, 90]. The first few multiples they share are [30, 60, 90] making 30 the smallest multiple 6 and 10 share.
Next, convert the fractions so each denominator equals the lowest common multiple:
\( \frac{7 x 5}{6 x 5} \) - \( \frac{4 x 3}{10 x 3} \)
\( \frac{35}{30} \) - \( \frac{12}{30} \)
Now, because the fractions share a common denominator, you can subtract them:
\( \frac{35 - 12}{30} \) = \( \frac{23}{30} \) = \(\frac{23}{30}\)
What is 4x2 - 9x2?
| 13x4 | |
| 13x2 | |
| -5x2 | |
| 13x-4 |
To add or subtract terms with exponents, both the base and the exponent must be the same. In this case they are so subtract the coefficients and retain the base and exponent:
4x2 - 9x2
(4 - 9)x2
-5x2
If the ratio of home fans to visiting fans in a crowd is 2:1 and all 43,000 seats in a stadium are filled, how many home fans are in attendance?
| 28,800 | |
| 36,000 | |
| 40,000 | |
| 28,667 |
A ratio of 2:1 means that there are 2 home fans for every one visiting fan. So, of every 3 fans, 2 are home fans and \( \frac{2}{3} \) of every fan in the stadium is a home fan:
43,000 fans x \( \frac{2}{3} \) = \( \frac{86000}{3} \) = 28,667 fans.
A tiger in a zoo has consumed 104 pounds of food in 8 days. If the tiger continues to eat at the same rate, in how many more days will its total food consumtion be 182 pounds?
| 6 | |
| 8 | |
| 5 | |
| 9 |
If the tiger has consumed 104 pounds of food in 8 days that's \( \frac{104}{8} \) = 13 pounds of food per day. The tiger needs to consume 182 - 104 = 78 more pounds of food to reach 182 pounds total. At 13 pounds of food per day that's \( \frac{78}{13} \) = 6 more days.