| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.25 |
| Score | 0% | 65% |
A circular logo is enlarged to fit the lid of a jar. The new diameter is 75% larger than the original. By what percentage has the area of the logo increased?
| 27\(\frac{1}{2}\)% | |
| 15% | |
| 37\(\frac{1}{2}\)% | |
| 20% |
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 75% the radius (and, consequently, the total area) increases by \( \frac{75\text{%}}{2} \) = 37\(\frac{1}{2}\)%
A tiger in a zoo has consumed 30 pounds of food in 5 days. If the tiger continues to eat at the same rate, in how many more days will its total food consumtion be 54 pounds?
| 4 | |
| 3 | |
| 7 | |
| 9 |
If the tiger has consumed 30 pounds of food in 5 days that's \( \frac{30}{5} \) = 6 pounds of food per day. The tiger needs to consume 54 - 30 = 24 more pounds of food to reach 54 pounds total. At 6 pounds of food per day that's \( \frac{24}{6} \) = 4 more days.
What is \( \frac{2}{6} \) + \( \frac{7}{12} \)?
| \( \frac{1}{6} \) | |
| 2 \( \frac{6}{13} \) | |
| \( \frac{9}{12} \) | |
| \(\frac{11}{12}\) |
To add 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 12 are [12, 24, 36, 48, 60, 72, 84, 96]. The first few multiples they share are [12, 24, 36, 48, 60] making 12 the smallest multiple 6 and 12 share.
Next, convert the fractions so each denominator equals the lowest common multiple:
\( \frac{2 x 2}{6 x 2} \) + \( \frac{7 x 1}{12 x 1} \)
\( \frac{4}{12} \) + \( \frac{7}{12} \)
Now, because the fractions share a common denominator, you can add them:
\( \frac{4 + 7}{12} \) = \( \frac{11}{12} \) = \(\frac{11}{12}\)
A factor is a positive __________ that divides evenly into a given number.
integer |
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mixed number |
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fraction |
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improper fraction |
A factor is a positive integer that divides evenly into a given number. For example, the factors of 8 are 1, 2, 4, and 8.
Which of the following is not an integer?
1 |
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\({1 \over 2}\) |
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-1 |
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0 |
An integer is any whole number, including zero. An integer can be either positive or negative. Examples include -77, -1, 0, 55, 119.