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2 years ago

If recycling 2,500 pounds of paper saves 20 trees, how many trees are saved when 4,000 pounds of paper are recycled?

Mathematics

1 answer:

Elena L [17]2 years ago

3 0

Answer:

This is a ratio question. Set 16/2000 = x/5000 and solve for x. = 40 trees

Step-by-step explanation:

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Two cargo trains are linked together, making of a total of 22 cars. The cars from one of the trains are carrying 15 tons each, a

DochEvi [55]

Let x be the number of 20 ton cars

Then,
380<{15(22-x)+20x}<400
380<{330-15x+20x}<400
380<{330+5x}<400

Subtract 330 on both sides
50<5x<70

Divide both sides by 5;
10<x<14

Therefore, the range of 20 tonne cars is between 10 and 14 cars.

6 0

3 years ago

Order the integers from least to greates<br>a. 5, -7, 6, -2, O

Nutka1998 [239]

-7, -2, 0, 5, 6 is the correct answer

3 0

3 years ago

On monday it took 5 builders to 3 1/2 hours to build a wall

zubka84 [21]

Answer: £ 81.38

Step-by-step explanation:

Given: On Monday,

5 builders took $3\dfrac{1}{2}$ hours ( i.e. $\dfrac{7}{2}$ hours ) to build a wall.

On Tuesday, only 2 builders were available.

As workers are inversely proportional to the time if the job remains constant.

Inverse variation equation : $x_1y_1=x_2y_2$

Let x be the time taken by 2 builders, then

$2\times x =5\times \dfrac{7}{2}$

$\Rightarrow\ x=\dfrac{35}{2}\times\dfrac{1}{2}=\dfrac{35}{4}=8.75$

So, 2 builders will take 8.75 hours.

Each paid £9.30 for each hour.

Then, each builder will be paid for the work completed on Tuesday = £9.30 x 8.75

≈ £ 81.38

Hence, each builder will be paid £ 81.38 for the work completed on Tuesday .

5 0

3 years ago

tapes-r-us is have a sale on hq tape players. The regular price is $60. The discount is $18. What percent discount is this?

olga nikolaevna [1]

The discount is 30%

Step-by-step explanation:

Given

Price of tape = $60

Discount = $18

In order to find the percentage, we will use the percentage formula

$Percentage = \frac{discount}{Price}*100\\= \frac{18}{60} *100\\=0.3 * 100\\= 30\%$

Hence,

The discount is 30%

Keywords: Percent, sale

Learn more about percentage at:

#LearnwithBrainly

7 0

3 years ago

A quantity p varies jointly with r and s. Which expression represents the constant of variation, k?

Zina [86]

The correct answer is p/rs.

In order to find this first state the direct variation with the constant k included.

p = krs

Now to find the value of k, we simply divide away the r and s

p/rs = k

3 0

3 years ago

Read 2 more answers