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3 years ago

12

When sandra walk through the house she saw that 18 lights are on and only one third of the lights were off how many lights were

off?

1 answer:

vovangra [49]3 years ago

4 0

Don't mind the length I used. It's just so you understand the answer clearly. Once you know how to do it, you will be able to do it in seconds.

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DIA [1.3K]

True. If you're just changing the form, yes. But remember when you change one side of an equation, you must change the other in the same way.

7 0

2 years ago

Read 2 more answers

How many 20 degree angles does it take to make a full turn?

scoundrel [369]

There is 360* in a circle, so you would divide 360 by 20 to get 18.

3 0

3 years ago

A new factory is growing fast and hiring a lot of new workers. Every week, the total number of workers doubles in size. If it ta

Elden [556K]

Answer:

9 weeks

Step-by-step explanation:

divide the full capacity by 2 to get 9 because 9 x 2 is 18 and half of the full capacity would be half capacity

5 0

2 years ago

A new crew of painters takes two times as long as the old painters. Together they can paint in 6 hours. How many hours does it t

babymother [125]

Let n be old painters time. Then the new painters are 2n. So:
1/n+1/2n=1/6
2+1=2n/6
2n=18
n=9
The old painters take 9 hours; the new ones take 18
☺☺☺☺

3 0

2 years ago

A cylinder is filled with 900 liters of water.find the area of its base if height of cylinder is 20dm.

Lisa [10]

The formula of the volume of a cylinder:

$V=\pi r^2H\\\\where:\\\\r-a\ radius\\H-a\ height\\\pi r^2-an\ area\ of\ base$

We have:

$V=900\ liters\\1L=1dm^3\ therefore\ V=900L=900dm^3$

and

$H=20\ dm$

substitute:

$\pi r^2\cdot20=900\ \ \ |:20\\\\\pi r^2=45\ dm^2$

Answer: The area of a base of the cylinder is equal 45 dm².

5 0

3 years ago