1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
ira [324]
3 years ago
6

There are some goats, cows, and sheep on a farm. 2/5 of the animals were goats. There are 3 times as many sheep as cows. If ther

e are 45 more goats than cows, how animals were there in the farm?
Mathematics
1 answer:
svetlana [45]3 years ago
7 0

Answer:

180

Step-by-step explanation:

First thing to do is to get all the animals in terms of cows, since that is our main unknown.  All the other animals' numbers are based on cows.  So let's call cows "x".  Then sheep is 3 times the number of cows, so sheep is 3x.  The number of goats is 45 more than the number of cows, so goats is x + 45.  Let's say, for the sake of ease, that the number of animals is "a".

Here's what we have so far:

# of animals: a

# of cows: x

# of sheep: 3x

# of goats: x + 45

We are told that 2/5 of the animals are goats.  In an equation, that is:

2/5 (animals) = goats, where the word "of" means to multiply, and the word "are" is the equals sign.  Filling in from our key above:

\frac{2}{5}a=x+45

That says that 2/5 of the animals are goats when goats is x + 45.

If 2/5 of the animals are goats, then 3/5 of the animals have to be cows and sheep.  In an algebraic equation:

\frac{3}{5}a=x + 3x.  

Let's go back to the first equation and get rid of the fraction by multiplying everything by 5.  When we do that we get

2a = 5(x + 45) so

2a = 5x + 225

Now let's get rid of the fraction in the second equation by multiplying everything by 5.  When we do that we get

3a = 5(x + 3x) or

3a = 5(4x) so

3a = 20x.  Solve that equation for a.

a=\frac{20}{3}x

Now that we have a in terms of x, we can sub that value in for a in the first equation to solve for x, the number of cows:

2(\frac{20}{3}x)=5x+225 and, simplifying:

\frac{40}{3}x=5x+225 and

\frac{40}{3}x-5x=225.  Get rid of the fraction here by multiplying everything by 3:

40x - 15x = 675 and

25x = 675 so

x = 27

That means that there are 27 cows.

Sheep is 3 times that, so there are 81 sheep.

Goats is 45 more than that, so there are 72 goats.

The total number of animals then is 27 + 81 + 72 which is 180.  Let's check that to see if the number of goats, 72, is 2/5 of 180.

\frac{2}{5}(180) = 72

So we got it!  Yay!  That was hard!!

You might be interested in
Can anyone help me ASAP!
TiliK225 [7]

Answer:

17.3 in

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
What is combined mean
FromTheMoon [43]
Combined in mathematics is to add together to find a total. If you combine 1 and 2 you get 3.
7 0
3 years ago
How to divide 33 photos into two groups so the ratio is 4 to 7
Nataliya [291]
33 photos in a 4x to 7x ratio

4x + 7x = 33
11x = 33
x = 3

33 photos can be put in a 4(3) to 7(3) ratio

which is a 12 to 21 ratio

so 12 photos on one side, and 21 on the other side to get the ratio of 4 to 7

Note:
<span>a(b) = ab = a x b = a times b</span>
3 0
3 years ago
2 üssü - 12 ile 25 üssü 2 nin çarpımı nedir?​
KengaRu [80]

Answer:

2 üssü 12 demek 2'yi 12 defa yanyana yazmak demektir yani 2×2×2×2×2×2×2×2×2×2×2×2×=4096 eder.

şimdi diğerini yapalım aynı şekilde yapmış olursak 25×25 =625 eder

ŞİMDİ SONUCU BULALIM:4096×625=2,560,000

KOLAY GELSİN

7 0
3 years ago
In the calculations shown, what will the units of the final answer be?
vazorg [7]

Answer: miles over hour

Step-by-step explanation:

just cuz

4 0
3 years ago
Other questions:
  • X^2+4x=-3<br>what would be the steps to find the answer of this equation?<br><br>to find x
    8·1 answer
  • Write the equation for the line parallel to the given line 4x-3y=9 and through the point (3, -1). Then Write the answers in slop
    8·1 answer
  • F(x)= 1/2x^2-4x+3 in standard form
    9·1 answer
  • The line contains the point (-4,-4) and is perpendicular to a line with a slope of 5/2 . The equation is this line is ?
    8·1 answer
  • 7 1/8 + 7 1/13= Give my answer as a mixed number
    15·2 answers
  • Which of the following is the equation of a line that is perpendicular to the graph of y = 2/5x − 1?
    10·1 answer
  • Write the percent as a fraction in simplest form 50%
    14·1 answer
  • True or false. The Axis of symmetry passes through the Vertex.​
    8·1 answer
  • Ana can bike 9 kilometers in 24 minutes. At this rate, how far can Ana bike in 1 minute? __ kilometer(s) per minute
    7·1 answer
  • (y−2)=3(x−1) whats the slope
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!