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gulaghasi [49]
3 years ago
8

Nicholas's sand castle is 30 cm tall and he is adding sand at a rate of 12 cm per minute. Nina's sand castle is 78 cm tall and s

he is adding more sand to it at a rate of 6 cm per minute. After how many minutes, x, will Nina and Nicholas's sand castles be the same height?
Mathematics
1 answer:
Brums [2.3K]3 years ago
3 0

Answer:

8 minutes

Step-by-step explanation:

Speed or Rate = Distance / time

Distance = Speed × time

Nicholas's sand castle is 30 cm tall and he is adding sand at a rate of 12 cm per minute.

Nicholas = Nina

30cm + (12cm/min)x

= 30 + 12x

Nina's sand castle is 78 cm tall and she is adding more sand to it at a rate of 6 cm per minute.

78cm + (6cm/min)x

78 + 6x

30 + 12x = 78 + 6x

12x - 6x = 78 - 30

6x = 48

x = 48/6

x = 8 minutes

Therefore, after 8 minutes, Nina and Nicholas's sand castles be the same height.

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Answer:

$27

Step-by-step explanation:

Thomas rents a car for his vacation. The mileage include with the rental is 54 miles. For every mile he drives over 54 miles, he needs to pay $1 4/5. If he drives 69 miles, how much extra does he need to pay?

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Total miles Thomas drives = 69 miles

Extra miles Thomas drives = 69 miles - 54 miles

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Step-by-step explanation:

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