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hammer [34]
3 years ago
9

A small school has 42 boys. If the ratio of boys to girls is 7 : 1, how many, students are?

Mathematics
2 answers:
babunello [35]3 years ago
8 0
There are a total of 48 students. Being 42 boys as mentioned earlier and 6 girls total attending too.

Please vote my answer brainliest! Thanks.
Digiron [165]3 years ago
4 0

Answer:

48

Step-by-step explanation:

Total ratio  = 7 + 1 = 8

Let the total number of students be x

Number of boys.

7/8 × x = 42

7/8 x = 42

Multiply both sides by 8

8 × 7/8 x = 42× 8

7x = 336

Divide both sides by 7

7x / 7 = 336/7

x = 336/7 = 48

Therefore total number of students is 48

I hope this was helpful, please rate as brainliest

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Help me some one plz (only part b)
Slav-nsk [51]

The school can expect to raise 1500p for charity.

<u>Explanation:</u>

(a)

The possibility space is solved in the image attached.

(b)

20p for each player

30p for lollipop

Number of people = 120

Charity amount = ?

Out of 12 outcomes, the probability of getting 7 is 3

So, probability of getting 7 for 120 people = \frac{3}{12} X 120

                                                                  = 30

Money earned from the players = 20p X 120

                                                  = 2400p

Cost of 30 lollipops = 30p X 30

                               = 900p

Money received for charity = 2400p - 900p

                                          = 1500p

                                         

Therefore, the school can expect to raise 1500p for charity.                                

5 0
3 years ago
Help help help help help help
Vsevolod [243]

Answer: 19 mins

Step-by-step explanation:

hope this helps

7 0
3 years ago
Andrea Is selling candles as a fundraiser she spent $50 on supplies for making the candles she plans to sell candles for $10 eac
dalvyx [7]

COMPLETE QUESTION:

Andrea is selling candles as a fundraiser. She spent $50 on supplies for making the candles. She plans to sell the candles for $10 each. Her profit can be modeled by C(x) = 10x - 50.

What type of function is this?

What is the domain and range of the function?

Answer:

- This function is one-to-one

- Domain D = {x: x is a whole number ≤ Z}

- Range R = {y: y is in -50, ..., (10Z - 50)}

Where Z is the number of candles she could produce with $50.

Step-by-step explanation:

Given that her profit is modeled by C(x) = 10x - 50

- This function is one-to-one, because it is in the form f(x) = y.

Let the number of candles she could make with $50 be Z.

Then the domain is the set of all whole numbers less or equal to Z.

D = {x: x is a whole number ≤ Z}

If there are infinite number of candles she could make with that money, then

D = (-infinity, infinity)

When x = 0, we have C = -50

When x = Z, we have C = 10Z - 50

The range is then given as

R = whole numbers from -50 up to (10Z - 50)

R = {y: y is in (50 -Z), ..., (10Z - 50)}

If there are infinite number of candles she could make with that money, then

R = (-infinity, infinity)

6 0
3 years ago
Find the area of a circle with the diameter of 3 centimeters. Use 3.14 for pi ().
wlad13 [49]

Answer:

7.065 sq. cm

Step-by-step explanation:

Diameter= 3 cm

Since 2r=d, the radius is 1.5 cm

Circle area formula:

πr^2 --> 3.14(r^2)

Plug in r:

A=3.14(1.5^2)

A=3.14(2.25)

A=7.065

3 0
3 years ago
3 equivalent ratios for 20/15
castortr0y [4]
4/3
40/30
60/45
Simply multiply or divide both the 20 and the 15 to get an equivalent ratio.
7 0
3 years ago
Read 2 more answers
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