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2 years ago

There are 6 girls and 18 boys in a class. What percentage of the class are girls?

Mathematics

2 answers:

lisabon 2012 [21]2 years ago

5 0

33.3% are girls in the class

grandymaker [24]2 years ago

4 0

Answer:

25% are girls

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Write an equivalent expression for 1/3b+2/3b-5/6(b+1)

ycow [4]

Answer:

I'm quite sure that the answer is b - 5/6b + 1 5/6

Hope this helps! Please mark brainliest! Have a great day!

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2 years ago

Michael got a job peeling potatoes. In the first two hours of his shift, he peeled 52 potatoes. How many potatoes can he peel in

AURORKA [14]

Answer:

I think 182

Step-by-step explanation:

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6 0

2 years ago

Read 2 more answers

100 students are interviewed to see which of biology, chemistry or physics they prefer. 52 of the students are girls. 29 of the

Ket [755]

Answer:

$45$ % of the students prefer biology.

Step-by-step explanation:

Let's read and write all the data from the question.

100 students are interviewed to see which of biology, chemistry and physics they prefer.

Therefore, we have three categories to classify the students :

A student that prefers biology

A student that prefers chemistry

And a student that prefers physics

52 of the students are girls. Therefore,

$100-52=48$ students are boys.

29 of the girls like biology best. In order to answer the question, we will only need the amount of boys that prefer biology and sum them to the amount of girls that like biology best.

24 of the boys prefer physics. Therefore,

$48-24=24$ is the sum of the boys that prefer chemistry and biology.

13 out of the 21 who prefer chemistry are girls. Therefore,

$21-13=8$ are boys that prefer chemistry.

If 24 is the sum of the boys that prefer chemistry and biology ⇒

$24-8=16$ are boys that prefer biology.

If we sum $29+16=45$ is the number of students that prefer biology.

If we want to calculate the percentage we need to divide the amount of students that prefer biology by the total of students interviewed and then multiply that number by 100 :

$(\frac{45}{100}).(100)=45$ %

45 % of the students prefer biology.

5 0

3 years ago

A gas tank consists of a cylinder with a hemisphere on top. It is made of metal that is 1 cm

Sophie [7]

The surface area of the cylinder is 5969.03 cm²

The internal volume is 23156.68 cm³

Given:

A gas tank consists of a cylinder with a hemisphere on top.
The thickness of the metal is 1 cm
The overall height is 90 cm
The external diameter is 20 cm

To Find
a) the surface area of the tank

We will add the area of the bottom circle of radius 10 cm (counting the 1 cm thickness in), the external surface area of cylinder of height (90 - 10) cm =80 cm and radius 10 cm, and the surface area of the hemisphere of radius 10 cm.

So, the surface area of the cylinder is

$\pi\times(10)^2+2\times\pi\times 10\times 80+ 2\times \pi \times (10)^2$
= π×(100+1600+200)

= π×(1900)

= 5969.03 cm²

b) To find the internal volume of the tank we find the internal volume of the hemisphere with an internal radius (10-1)=9 cm,
the internal volume of the cylinder of radius 9 cm and height (80-1) cm

= $\frac{4}{3}\times \pi \times 9^3$ + $\pi\times 9^2\times 79$