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2 years ago

7

A 2400 gallon pool is being filled at a rate of 40 gallons per minute. At this rate, how many minutes will it take to fill this

pool 1/2 full?

2 answers:

ira [324]2 years ago

6 0

After 30 minutes the pool will be half full

seropon [69]2 years ago

5 0

2400/2 to find out half of the pool size then divide by 40 to find out how fast it's filling up per minute.

30 gallons per minute

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Answer:

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Step-by-step explanation:

Let us consider a circular disk. The inner radius of the disk be r and the outer diameter of the disk be (r+Δr).

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= $\pi (r+\triangle r)^2- \pi r^2$

$=\pi [r^2+2r\triangle r+(\triangle r)^2-r^2]$

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Since (Δr)² is very small, So it is ignorable.

∴ $A=2\pi r\triangle r$

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We know,

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$=(2r \pi \triangle r)(\frac{40}{1+r^2}})$

Total mass $M=\sum_{i=1}^n \frac{80r_i\pi }{1+r^2}\triangle r_i$

Therefore

$\sum_{i=1}^n \frac{80r_i\pi }{1+r^2}\triangle r_i=\int_0^5 \frac{80r\pi }{1+r^2}dr$

$=40\pi[ln(1+r^2)]_0^5$

$=40\pi [ln(1+5^2)-ln(1+0^2)]$

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Answer:

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Step-by-step explanation:

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Answer:

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Step-by-step explanation:

Let he bought c packages of chocolate bars and t packages of toffee bars,

Since, he bought 1 fewer package of chocolate bars than toffee bars.

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2 years ago

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$\frac{1}{6}$ can also be written as $6^{-1}$

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