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Blizzard [7]
3 years ago
7

Twice the sum of a number and six decreased by fifteen is the same as eighteen more than the product of five and the number. Fin

d the number.
Mathematics
1 answer:
Arlecino [84]3 years ago
4 0

Answer:

-9

Step-by-step explanation:

2(n+6) -15 = 5n+18

2n + 12 - 15 = 5n + 18

2n - 3 = 5n + 18

2n = 5n + 21

-3n = 21

n = -9

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From points A and B, the distance between which is 1020 mi, two trains left simultaneously towards each other. The speed of one
djverab [1.8K]

Complete question :

From points A and B, the distance between which is 1020 mi, two trains left simultaneously towards each other. The speed of one train was 10 mph greater than the speed of the other one. In 5 hours the trains had not met yet and were 170 mi apart. Find the speed of the trains.

Answer:

Train A = 80 miles per hour

Train B = 90 miles per hour

Step-by-step explanation:

Given that :

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Speed of B = x + 10

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Distance = speed * time

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Hence, distance covered after 5 hours ;

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<u>Hope this helped!</u>

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5\frac{1}{16}

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