7. Sea turtles lay about 2,500 and 3,000 nests each year, and lay an average of 200 eggs per nest. Only 1 in 1,000 hatchlings will reach maturity. What percent will reach maturity.
a. 10%
b. 1% (my guess)
c. .1%
d. .01%
12. It took Mr. E 25 minutes to drive to St. Augustine, what fraction of an hour did it take?
a. 1/4
b. 1/3 (my guess)
c. 5/12
d. 7/12
Don't guess. Use math.
100(1/1000) = ?
25/60 = ?
I understand 7, but I don't get 12, 25/60 is 41.
The answer for 7 is not b.
12.
25/60 is a fraction, not a whole number.
To find the percent of sea turtle hatchlings that will reach maturity, we need to calculate the ratio of the number of hatchlings that reach maturity to the total number of eggs laid.
First, we need to determine the total number of eggs laid per year. We are given that sea turtles lay about 2,500 to 3,000 nests each year, and each nest has an average of 200 eggs. Therefore, the total number of eggs laid per year can be calculated by multiplying the average number of eggs per nest (200) by the number of nests (between 2,500 and 3,000).
Let's calculate the total number of eggs laid per year:
Total Number of Eggs = Average number of eggs per nest × Number of nests
= 200 × (2500 to 3000)
Assuming the average is 2750 (midpoint between 2,500 and 3,000):
Total Number of Eggs = 200 × 2750
= 550,000
Now, we need to determine the total number of hatchlings that will reach maturity. We are given that only 1 in 1,000 hatchlings will reach maturity. Therefore, we can calculate the number of hatchlings that reach maturity by dividing the total number of eggs by 1,000.
Let's calculate the number of hatchlings that will reach maturity:
Number of Hatchlings that Reach Maturity = Total Number of Eggs / 1,000
= 550,000 / 1,000
= 550
Finally, to find the percent of hatchlings that will reach maturity, we need to divide the number of hatchlings that reach maturity by the total number of hatchlings (which is the same as the total number of eggs) and multiply by 100.
Let's calculate the percent of hatchlings that will reach maturity:
Percent = (Number of Hatchlings that Reach Maturity / Total Number of Eggs) × 100
= (550 / 550,000) × 100
= 0.1%
Therefore, the correct answer is c. 0.1%.
Moving on to the second question, we need to convert the given time in minutes to fractions of an hour.
There are 60 minutes in an hour. To convert minutes to hours, we need to divide the given number of minutes by 60.
Let's calculate the fraction of an hour:
Fraction of an Hour = Time in Minutes / 60
= 25 / 60
Since the numerator (25) cannot be further divided by any common factor with the denominator (60), the fraction 25/60 is already in its simplest form.
Therefore, the correct answer is not represented among the options given.