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wolverine [178]
3 years ago
5

A diamond ring that normally sells for $1,275 is on sale for $1,020. A ruby ring that normally sells for $290 is on sale for $20

3.
Mathematics
1 answer:
Elena-2011 [213]3 years ago
5 0

Answer:

what is the question?

Step-by-step explanation:

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Given that the red light blinks at intervals of 4 seconds, the green at 5 seconds and the white at 6 seconds.

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We have to find when will they blink together again?

First let us know, at what intervals they all together blink.

For that we have to find the lcm of 4, 5, 6.

L.C.M (4, 5, 6) = 2 x L.C.M(2, 5, 3)

As 2,3,5 are primes, we can’t take common further, so multiply all  

= 2 x 2 x 5 x 3

= 4 x 15  = 60

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Then, after 8 : 49 pm, they will blink at 8 : 49 + 1 = 8 : 50 pm.

Hence, they all blink at 8 : 50 pm.

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