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nata0808 [166]
3 years ago
10

Seven less than a number is 14 more than 2 times that number. What is the number?

Mathematics
1 answer:
ratelena [41]3 years ago
4 0

Answer:

x=-21

Step-by-step explanation:

x-7=2x+14

-7=x+14

-21=x

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7 pipes fill a tank in 50 minutes. How many minutes does it take if there are 11 pipes?
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Answer: With 11 pipes, you need 31.82 minutes to fill the tank.

Step-by-step explanation:

Let's define R as the rate at which one single pipe can fill a tank.

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Whit this equation, we can find the value of R:

R = 1 tank/(7*50min) = (1/350) tank/min.

Now that we know the value of R, we can do the same calculation but now with 11 pipes.

Then the time needed to fill the tank, T, is such that:

11*(1/350 tank/min)*T = 1 tank

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T = 1 tank/(11*(1/350 tank/min)) = 31.82 min

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2 years ago
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3 years ago
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