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3 years ago

10) 9 people can paint a bridge in 5 hours,

Mathematics

1 answer:

ale4655 [162]3 years ago

8 0

Step-by-step explanation:

The number of people to paint the bridge is inversely proportional to the number of hours it takes.

(If there are more people, it will take less time etc.)

9 people can paint the bridge in 5 hours.

=> 2 people can paint the bridge in 5 * (9/2) = 22.5 hours.

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2.4424733467684015382.<br> Is it rational or irrational

Vsevolod [243]

Answer:

rational

Step-by-step explanation:

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3 years ago

A circular plate has circumference 21.4 inches. What is the area of this plate? Use 3.14 for pi.

Brut [27]

Answer:

The area of this plate is $36.31\ \text{inches}^2$ .

Step-by-step explanation:

We have,

Circumference of a circular plate, C = 21.4 inches

The circumference of a circular shape is given by :

$C=2\pi r$

r is radius of circular shape

$r=\dfrac{C}{2\pi}\\\\r=\dfrac{21.4}{2\times 3.14}\\\\r=3.4\ \text{inches}$

Area of this plate is given by :

$A=\pi r^2\\\\A=\pi (3.4)^2\\\\A=36.31\ \text{inches}^2$

So, the area of this plate is $36.31\ \text{inches}^2$ .

8 0

3 years ago

Graphic DesignWorks ships the t-shirts it makes in boxes that measure 20 in x 18 in x 15 in. The company rents a storage space t

ioda

Answer:

D) 1,036,800 boxes

Step-by-step explanation:

The volume of a box is ...

(20 in)(18 in)(15 in) = 5400 in^3

The volume of the storage space is ...

(300 ft)(240 ft)(45 ft) = 3,240,000 ft^3

Then the number of boxes that will fit in the storage space is ...

(3240000 ft^3)(1728 in^3/ft^3)/(5400 in^3/box) = 1,036,800 boxes

8 0

3 years ago

Write down a multiple of 8 that is between 20 and 50.

serg [7]

Answer:

24, 32, 40, or 48

Step-by-step explanation:

Count by 8.

8 0

3 years ago

Read 2 more answers

The biggest among three numbers is 2.4 larger than the smallest one. If 15 times the smallest one is equal to 12 times the secon

g100num [7]

Answer:

Step-by-step explanation:

Let x represent smallest number and y represent second number.

We have been given that the biggest among three numbers is 2.4 larger than the smallest one. So biggest number would be $x+2.4$ .

We are also told that 15 times the smallest one is equal to 12 times the second and 10 times the third. We can represent this information in equations as:

$15x=12y...(1)$

$15x=10(x+2.4)...(2)$

Upon solving 2nd equation, we will get:

$15x=10x+24$

$15x-10x=10x-10x+24$

$5x=24$

$x=\frac{24}{5}$

$x=4.8$

Therefore, the smallest number is 4.8.

The biggest number would be $x+2.4\Rightarrow 4.8+2.4=7.2$ .

Upon substituting $x=4.8$ in equation (1), we will get:

$15(4.8)=12y$

$72=12y$

$y=\frac{72}{12}$

$y=6$

Therefore, 2nd number would be 6.

Let us find sum of all numbers as:

$4.8+6+7.2=18$

Therefore, the sum of all 3 numbers would be 18.

5 0

3 years ago