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Lilit [14]
3 years ago
10

Two grandparents want to pick up the mess that their granddaughter had made in her playroom. One can do it in 15 minutes working

alone. The​ other, working​ alone, can clean it in 12 minutes. How long will it take them if they work​ together?
Mathematics
1 answer:
Crank3 years ago
5 0

Answer:

  6 2/3 minutes

Step-by-step explanation:

Their rates in "jobs per hour" are ...

  (60 min/h)/(15 min/job) = 4 jobs/h

and

  (60 min/h)/(12 min/job) = 5 jobs/h

So, their combined rate is ...

  (4 jobs/h) + (5 jobs/h) = 9 jobs/h

The time required (in minutes) is ...

  (60 min/h)/(9 jobs/h) = (60/9) min = 6 2/3 min

Working together, it will take them 6 2/3 minutes.

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5+3w+3-w combine like terms to simplify
andreev551 [17]

Answer:

8 + 2w

Step-by-step explanation:

⇒ Change all signs to addition (subtraction is the same as adding a negative):

5 + 3w + 3 + -w

⇒ Since the expression is now all addition, you can rearrange them in any order. So group the terms together by their type:

5 + 3 + 3w + -w

⇒ Simplify:

8 + 2w

<u>Answer:</u> 8 + 2w

<em />

<em>Hope this helps!</em> :)

8 0
3 years ago
Read 2 more answers
A bake sale has 3 cakes for sale. Each cake was cut into 4 slices. Each slice was sold for $9. What was the total amount earned
Vaselesa [24]
Answer: Total amount is 108 because 9 times 4 is 36. So 36+36+36=108
6 0
3 years ago
2Y=5XSquared<br> I don’t have the power symbols on my phone.<br> How do I solve for Y?
gizmo_the_mogwai [7]
Divide both sides by two.
6 0
3 years ago
I don't know I need help please
Leya [2.2K]
It's the same angle. The equation, then, is 5y+1=51. Subtract one from both sides, so now you've got 5y=50. Divide each side by 5 and you've got y=10.
3 0
3 years ago
Solve for the unknown variable: -8m - 9 = 39
Lemur [1.5K]

Answer:

m =-6

Step-by-step explanation:

To solve for the unknown variable, m, we have to get m by itself. Perform the opposite of what is being done to the equation.

-8m-9=39

9 is being subtracted from-8m, so add 9 to both sides. Addition is the opposite of subtraction.

-8m-9+9=39+9

-8m=39+9

-8m=48

-8 and m are being multiplied. Divide both sides by -8, because division is the opposite of multiplication

-8m/-8=48/-8

m=48/-8

m= -6

6 0
3 years ago
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