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sergey [27]
3 years ago
6

Total students= 27; girls:total students = 2:3. How many boys and girls are there?

Mathematics
2 answers:
mote1985 [20]3 years ago
6 0

Answer:

<em>18 girls and 9 boys</em>

Dimas [21]3 years ago
4 0

Answer:

Step-by-step explanation:

2:3                     ?:27

How does 3 get to 27? x9.              2 x 9?           18

2:3                     18:27

Information: 18 girls and 27 students.

The others must be boys. 27 - 18 = 9

There are 9 boys and 18 girls. Ratio: 9 to 18 or 9:18 or 9/18 You can simplify to 1 boy for every 2 girls. Ratio: 1 to 2 or 1:2 or 1/2

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3 years ago
A sphere and a cylinder have the same radius and height. The volume of the cylinder is 21m. what is the volume of the sphere.​
Goshia [24]

Answer:

The volume of the sphere is 14m³

Step-by-step explanation:

Given

Volume of the cylinder = 21m^3

Required

Volume of the sphere

Given that the volume of the cylinder is 21, the first step is to solve for the radius of the cylinder;

<em>Using the volume formula of a cylinder</em>

The formula goes thus

V = \pi r^2h

Substitute 21 for V; this gives

21 = \pi r^2h

Divide both sides by h

\frac{21}{h} = \frac{\pi r^2h}{h}

\frac{21}{h} = \pi r^2

The next step is to solve for the volume of the sphere using the following formula;

V = \frac{4}{3}\pi r^3

Divide both sides by r

\frac{V}{r} = \frac{4}{3r}\pi r^3

Expand Expression

\frac{V}{r} = \frac{4}{3}\pi r^2

Substitute \frac{21}{h} = \pi r^2

\frac{V}{r} = \frac{4}{3} * \frac{21}{h}

\frac{V}{r} = \frac{84}{3h}

\frac{V}{r} = \frac{28}{h}

Multiply both sided by r

r * \frac{V}{r} = \frac{28}{h} * r

V = \frac{28r}{h} ------ equation 1

From the question, we were given that the height of the cylinder and the sphere have equal value;

This implies that the height of the cylinder equals the diameter of the sphere. In other words

h = D , where D represents diameter of the sphere

Recall that D = 2r

So, h = D = 2r

h = 2r

Substitute 2r for h in equation 1

V = \frac{28r}{2r}

V = \frac{28}{2}

V = 14

Hence, the volume of the sphere is 14m³

4 0
3 years ago
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Answer:

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Step-by-step explanation:

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Answer:

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