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2 years ago

9 pipes can fill a tank in 4 hours. How long will it take if there are 12 pipes of same

Mathematics

1 answer:

Rufina [12.5K]2 years ago

7 0

Answer:

3 hours

Step-by-step explanation:

9 pipes/4 hours= 3 pipes/1 hour

The rate the pipes fill a tank will change by 1 hour as there are 3 more pipes.

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iogann1982 [59]

$a_n=a_1+(n-1)d$ - the formula of n-th term of an arithmetic sequence.

We have:

$a_5=12.4;\ a_9=22.4$

$a_9-a_5=(9-5)d\to4d=22.4-12.4\\\\4d=10\ \ \ \ |:4\\\\d=2.5$

$a_{31}=a_9+(31-9)d\to a_{31}=22.4+22\cdot2.5=77.4$

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3 years ago

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den301095 [7]

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Step-by-step explanation:

Add 452 ; 452+

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Step-by-step explanation:

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3 years ago

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elena55 [62]

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Step-by-step explanation:

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