| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.92 |
| Score | 0% | 58% |
What is \( \frac{5}{8} \) + \( \frac{3}{16} \)?
| 1 \( \frac{3}{6} \) | |
| \(\frac{13}{16}\) | |
| \( \frac{7}{16} \) | |
| 1 \( \frac{6}{9} \) |
To add these fractions, first find the lowest common multiple of their denominators. The first few multiples of 8 are [8, 16, 24, 32, 40, 48, 56, 64, 72, 80] and the first few multiples of 16 are [16, 32, 48, 64, 80, 96]. The first few multiples they share are [16, 32, 48, 64, 80] making 16 the smallest multiple 8 and 16 share.
Next, convert the fractions so each denominator equals the lowest common multiple:
\( \frac{5 x 2}{8 x 2} \) + \( \frac{3 x 1}{16 x 1} \)
\( \frac{10}{16} \) + \( \frac{3}{16} \)
Now, because the fractions share a common denominator, you can add them:
\( \frac{10 + 3}{16} \) = \( \frac{13}{16} \) = \(\frac{13}{16}\)
The total water usage for a city is 25,000 gallons each day. Of that total, 30% is for personal use and 52% is for industrial use. How many more gallons of water each day is consumed for industrial use over personal use?
| 13,000 | |
| 8,400 | |
| 5,500 | |
| 12,800 |
52% of the water consumption is industrial use and 30% is personal use so (52% - 30%) = 22% more water is used for industrial purposes. 25,000 gallons are consumed daily so industry consumes \( \frac{22}{100} \) x 25,000 gallons = 5,500 gallons.
A triathlon course includes a 300m swim, a 40.3km bike ride, and a 6.800000000000001km run. What is the total length of the race course?
| 33.4km | |
| 53.5km | |
| 47.4km | |
| 56km |
To add these distances, they must share the same unit so first you need to first convert the swim distance from meters (m) to kilometers (km) before adding it to the bike and run distances which are already in km. To convert 300 meters to kilometers, divide the distance by 1000 to get 0.3km then add the remaining distances:
total distance = swim + bike + run
total distance = 0.3km + 40.3km + 6.800000000000001km
total distance = 47.4km
If the ratio of home fans to visiting fans in a crowd is 2:1 and all 37,000 seats in a stadium are filled, how many home fans are in attendance?
| 33,333 | |
| 28,000 | |
| 24,667 | |
| 40,000 |
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:
37,000 fans x \( \frac{2}{3} \) = \( \frac{74000}{3} \) = 24,667 fans.
A tiger in a zoo has consumed 54 pounds of food in 6 days. If the tiger continues to eat at the same rate, in how many more days will its total food consumtion be 90 pounds?
| 3 | |
| 1 | |
| 4 | |
| 5 |
If the tiger has consumed 54 pounds of food in 6 days that's \( \frac{54}{6} \) = 9 pounds of food per day. The tiger needs to consume 90 - 54 = 36 more pounds of food to reach 90 pounds total. At 9 pounds of food per day that's \( \frac{36}{9} \) = 4 more days.