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egoroff_w [7]
3 years ago
9

20 people is only 4/5 of the total people....what is the total

Mathematics
2 answers:
rewona [7]3 years ago
6 0
Let total number of people be x
Therefore, 4/5 of x = 20
4/5*x = 20
x = 20*5/4
x = 5*5
x = 25
sleet_krkn [62]3 years ago
4 0
The total is 20*5/4=25
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Solve the problem:
stepan [7]

volume of the box is 675 cubic inches

A machine produces open boxes using square sheets of plastic.

It is a square sheet so length and width are same

Lets assume length as x so width is also x

The machine cuts equal-sized squares measuring 3 inches on a side from each corner of the sheet.

After turning up the sides the height of the box becomes 3 inches

We know the volume of a box formula

Volume = Length * width * height

We know length is  x , width is x  and height = 3

So V = x * x * 3

Given volume = 675 cubic inches

675 = x * x * 3

675 = x^2* 3

Divide by 3 on both sides

225 = x^2

Now we take square root on both sides

x = 15

the length of one side of the open box is 15 inches.



5 0
3 years ago
Two trains travel at right angles to each other after leaving the same train station at the same time. Two hours later they are
Alex787 [66]

Answer:

15 miles per hour is the speed of the slower train.

Step-by-step explanation:

As given in the figure attached,

Let the speed of train 1 is v and train 2 is u.

Therefore, distance traveled in 2 hours by train 1 will be = 2v miles

and distance traveled by train 2 will be = 2u miles

Now we can see in the figure a right angle triangle is formed by the two trains.

AB² + BC² = AC²

(2v)² + (2u)²= (65.30)²

4v² + 4u² = 4264.09

Now we divide this equation by 4

v² + u² = 1066.02

If speed of the slower train is v miles per hour then as per statement of the question.

u = v - 14

v = u + 14

By putting the value of v in the equation

(u + 14)² + u² = 1066

u² + 196 + 28u + u² = 1066

2u² + 28u + 196 = 1066

2u² + 28u + 196 - 1066 = 0

2u² + 28u - 870 = 0

By diving this equation by 2

u² + 14u - 435 = 0

u² + 29u - 15u - 435 = 0

u(u + 29) - 15(u + 29) = 0

(u + 29)(u - 15) = 0

u = -29, 15

Since speed can not be with negative notation so u = 15 miles per hour will be the speed.

Therefore, 15 miles per hour is the speed of the slower train.

5 0
3 years ago
Help me please...!!!!!!
goblinko [34]
B would be the answer for sure
4 0
3 years ago
Read 2 more answers
A line passes through the point (-8, 2) and has a slope of -5/4.
UNO [17]

Answer:

y=-5/4x-8

Step-by-step explanation:

2=-5/4(-8)+b

2=10+b

2-10=10-10b

-8=b

8 0
3 years ago
Find the median, first quartile, third quartile, and interquartile range of the data. 35,20,21,31,22,24,28
max2010maxim [7]

Answer:

median is 24

first quartile is 21

third quartileis 31

interquartile range 10

Step-by-step explanation:

median is 24

first quartile is 21

third quartileis 31

interquartile range 10

6 0
3 years ago
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