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Goshia [24]
3 years ago
8

An urn contains marbles of four colors: red, yellow, blue, and green. All but 45 of the marbles are red; all but 45 are yellow;

all but 45 are blue; and all but 60 are green. How many of the marbles are green?
Mathematics
1 answer:
IceJOKER [234]3 years ago
5 0

Answer:

5

Step-by-step explanation:

Let the number of

red marbles be r

blue marbles be b

yellow marbles be y and

green marbles be g

Let the Total number of marbles be T then

r + y + b + g = T

If all but 45 of the marbles are red then

y + b + g = 45

As such, r + 45 = T

all but 45 are yellow;

r + b + g = 45

As such, y + 45 = T

all but 45 are blue;

y + r + g = 45

As such, b + 45 = T

It means that the number of red, yellow and blue marbles are equal

Hence y = b = r

If all but 60 are green

y + b + r = 60

y + y + y = 60

3y = 60

y = 60/3 =20

This means that there are 20 yellow marbles, 20 red marbles and 20 green marbles

The total number of marbles T = 20 + 45 = 65

As such, g + 60 = T

g + 60 = 65

g = 65 - 60

= 5 marbles

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Step-by-step explanation:

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3 years ago
What percent of 82 is 9.75. Round your answer to the nearest tenth
AysviL [449]

Hi there!

8 would be the nearest ten of 7.995..

<em><u>1.Multiply 82 with 0.01:</u></em>

<em><u /></em>82<em><u>·</u></em>0.01=0.82<em><u /></em>

<em><u>2.Multiply the terms:</u></em>

<em><u /></em>0.82<em><u>·</u></em>9.75=7.995<em><u /></em>

<em><u>3.Round the term:</u></em>

<em><u /></em>7.995=8<em><u /></em>

Therefore, 82% of 9.75 in nearest tenth is 8.

4 0
3 years ago
I want to buy a car for $17,500 and I make 13 an hour roughly how long would it take me to reach my goal? &amp; how many hours w
Aneli [31]

Answer:

1347 hours

Step-by-step explanation:

Assuming the income is <u>net income</u> (total after taxes etc.):

  • Cost of car = $17,500
  • Net income = $13 per hour

To calculate the number of hours to be worked to save enough to buy the car, divide the cost of the car by hourly net income:

\begin{aligned}\implies \textsf{Number of hours to work} & = \dfrac{\textsf{Cost of car}}{\textsf{hourly net income}}\\\\& = \sf \dfrac{17500}{13}\\\\& = \sf 1346.1538...\end{aligned}

We have to round the number up to <u>1347 hours</u>, as only $17,498 will be saved if 1346 hours are worked.

The average working week is approximately 40 hours, therefore to calculate how many weeks it would take to earn enough money to purchase the car, divide the number of hours by 40:

⇒ 1347 ÷ 40 = 33.675

So it would take 34 weeks, working an average of 40 hours a week and not spending <u>any</u> of the money earned, to save enough to purchase the car.

8 0
2 years ago
Read 2 more answers
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Answer:

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Other pairs may be congruent, but they are not vertical angles. The lines that look parallel must be assumed to be NOT parallel, because they are not marked in the diagram as being parallel. Thus ∠8 ≠ ∠12, for example.

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