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lorasvet [3.4K]
3 years ago
11

The numbers of boys and girls in a class was in the ratio 2:5. After 5 girls were transferred to another class, half of the rema

ining students were boys. How many more girls than boys were there in the class at first?
​
Mathematics
2 answers:
I am Lyosha [343]3 years ago
8 0

Answer:

15

Step by step explanation

Artist 52 [7]3 years ago
6 0

Answer:

15

Step-by-step explanation:

If there are 10 boys and 25 girls, which is a ratio of 2:5, then when 5 girls are transferred, there are 10 boys and 20 girls, meaning half of them are boys, so the class started out with 15 more girls than boys.

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Caroline works in her family restaurant waiting on tables. She is $8.25 per hour for all hours up to 37 in one week and then tim
WINSTONCH [101]

Answer:

404.25 dollars

Step-by-step explanation:

First, we do 8.35 times 37, and we get 305.25.

Next, we subtract 37 from 45 and get 8.

Then, we do divide 8.25 in half, and get 4.125.

After that we add 4.125 to 8.25 and get 12.375.

Then we do 12.375 times 8 and get 99

Finally, we add 99 and 305.25 together and get 404.25 dollars.

4 0
3 years ago
cards marked with numbers 2 to 101 are placed in a box and mixed thoroughly. one card is drawn from this box. find the probabili
Kamila [148]

number of cards = 100

number less than 14 = {2,3,...,13} = 12

number perfect square = {4, 9, 16, 25, 36, 49, 64, 81, 100} = 9

so

a) probability = 12/100 = 3/25

b) probability = 9/100

7 0
3 years ago
You measure 33 backpacks' weights, and find they have a mean weight of 36 ounces. Assume the population standard deviation is 12
saul85 [17]

Answer:

E=3.4363

Step-by-step explanation:

#Given a significance level of \alpha=1-CI=1-0.90=0.1 and

\bar x=36, \ \sigma=12.1 \ n=41, the critical value is,z_\alpha_/_2=z_\alpha_/_0_._0_5=1.645

#the margin of error can then be calculated as:

E=z_\alpha_/_2\times\frac{\sigma}{\sqrt n}=1.645\times \frac{12.1}{\sqrt 33}\\\approx 3.4363

Hence the margin of error is 3.4363

8 0
3 years ago
Is 14 quarter inches the most common measurement
borishaifa [10]
^ if you're talking universally, no it would be cm. But no one really says "quarter inches". You would just say inches
7 0
4 years ago
What is the most accurate measurement of 1 pound?
PtichkaEL [24]

0.45 Kilogrammes

Or

450 Grams

3 0
3 years ago
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