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stiv31 [10]
2 years ago
15

4. 225 is 75% of what number?

Mathematics
1 answer:
scoray [572]2 years ago
3 0

Answer:

300

Step-by-step explanation:

\frac{225}{x} = \frac{75}{100}

Since 225 is 75% of a whole, write the proportion such that 225 corresponds to 75% and x, the number we're searching for, corresponds with 100%

Cross multiply to solve and divide by 75 to isolate x:

225 x 100 = 75x

22500 = 75x

300 = x

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the bacteria in a certain culture double every 7.3 hours.The culture has 6000 bacteria at the start.how many bacteria will the c
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<span>The bacteria in a certain culture double every 7.1 hours.
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<span>Note: Let C denote correct and I denote incorrect. Suppose that guessing results in 8 correct and 2 incorrect answers. One possible outcome is CCCCCCCCII, for example. We can think of the number of ways of getting exactly 8 correct to be the same as the number of ways of selecting 8 spots for the correct answers times the number of ways of selecting two spots for the remaining two answers. There are (10 C 8) ways to select the positions for the correct answers and precisely one way to select the remaining two positions for the incorrect answers. Therefore, there are there are 10 C 8 = 45 ways to get 8 correct. Similarly, there are 10 C 9 = 10 ways to get 9 correct, and 10 C 10 = 1 way to get all 10 correct.</span>
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3 years ago
Read 2 more answers
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