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miskamm [114]
3 years ago
15

There is a string of red and blue lights strung around a window. The red lights blink every 3 second and the blue lights every 5

seconds. How many times will they blink at re same time in one minute?
Mathematics
2 answers:
Vladimir79 [104]3 years ago
8 0

Answer:

They will blink 4 times together in one minute.

Step-by-step explanation:

The amount it takes for them to blink together is the least common multiple between the time it takes for each of them to blink together.

The red light blinks each 3 seconds.

The blue light blinks each 5 seconds.

The least common multiple between 3 and 5 is 15. So they will blink together each 15 seconds.

Each minute has 60 seconds. So they will blink 60/15 = 4 times together in one minute.

Ann [662]3 years ago
7 0

Find the lowest common multiple of 3 and 5, that is 15

the lights will blink together every 15 seconds

in 1 minute blink together \frac{60}{15} = 4 times

that is at 15, 30, 45 and 60


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The ceiling of Katie’s living room is a square that is 15 ft long on each side. To decorate for a party, she plans to hang crepe
goldfiish [28.3K]

I think that 3 rolls is wrong and that 6 rolls is right. If you create a 15 by 15 square and draw two lines through the center that connect to the opposite corner, you'll be able to use the Pythagorean Theorem.


Perimeter: 15+15+15+15=60ft.


Length of Line from Corner to Corner:

(15)(15)+(15)(15)=C^2

225+225=C^2

450=C^2

21.2=C

21.2(2)= 42.4ft.

42.4ft.+60ft.= 102.4ft.

102.4ft. divided by 20ft. = 5.12 = <u>6 rolls</u>



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3 years ago
What does the digit 6 represent in ?
marshall27 [118]

Answer:

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3 years ago
Darin jogs at a rate of 7.5 miles per hour. How many miles per minute does Darin jog?
Svetlanka [38]
It would be 7.5/60 which equals .125
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3 years ago
4/5 of 40
algol [13]
4/5 of 40 = 32
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3 years ago
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Now, let's do the same as we did for the previous one here.

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notice again, how did we get 84 for the 4th element's coefficient? well 36 * 7 / 3.  and so on.  And you can just expand it from there.
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3 years ago
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