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mestny [16]
2 years ago
5

One pipe can fill a swimming pool in 8 hours. Another pipe takes 12 hours. How long will it take to fill the pool if both pipes

are used simultaneously?
Mathematics
1 answer:
Nookie1986 [14]2 years ago
5 0
For 4 h and 48 min. The first pipe fills the whole pool for 8 hours so from here we see that it fills 1/8 each hour. The second pipe fills it for 12 hours so it fills 1/12 each hour. Now both of them together fill 1/8 + 1/12 of the pool each hour. That equals: 1st pipe 3/24 of the pool each hour and the 2nd pipe 2/24 of the pool each hour. So, the two pipes together fill 3/24 + 2/24 each hour. That's 5/24 of the pool each hour.
1st hour: 5/24
2nd hour: 10/24
3rd hour: 15/24
4th hour: 20/24
And we need 4/24 more. So, if 5/24 is 1 h, then 1/24 is (60 minutes/5) 12 minutes. We need 4*1/24 and that is 12 minutes * 4 and that is 48 minutes.

So, they will fill the pool for 4 h and 48 min.
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Using appropriate properties find: 2/3 × 3/4 + 3/7 × 3/4​
Viktor [21]

Answer:

\frac{23}{28}

Step-by-step explanation:

\frac{2}{3}  \times  \frac{3}{4}  +  \frac{3}{7}  \times  \frac{3}{4}

=  >  \frac{3}{4} ( \frac{2}{3}  +  \frac{3}{7} )

=  >  \frac{3}{4}  \times  \frac{23}{21}

Reducing 3 from numerator and denominator,

=  >  \frac{23}{4 \times 7}  =  \frac{23}{28}

3 0
2 years ago
{24, 95, 76, 60, 15, 48, 80, 75}<br> a.<br> Mean =<br> b.<br> Median<br> c.<br> Mode =
sp2606 [1]

Answer:

a)59.125, b)67.5, c)None

Step-by-step explanation:

Mean = All values added up and divided by the number of values
\frac{24+95+76+60+15+48+80+75}{8}

Median = Put all numbers in order from least to most and use the middle one, if there are two, use the mean of those two
15, 24, 48, 60, 75, 76, 80, 95. The middle ones are 60 & 75 so \frac{60+75}{2}

Mode = The number that repeats more times. In this case none of them repeat.

8 0
2 years ago
Order these numbers from least to greatest.<br> 1.3571, 1.4, 1.035, 1.35
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1.035,1.3571,1.35,1.4
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2 years ago
Write an equation in point-slope form of a line with a slope of –4 that goes through the point J(–5, 6).
Fittoniya [83]
The equation is y = -4x + 26.
5 0
3 years ago
Last year, Kevin had 20,000 to invest. He invested some of it in an account that paid 6% simple interest per year, and he invest
tester [92]

$13,000 was invested at 6% whereas $7,000 was invested at 10% using simple interest approach

What is simple interest?

Simple interest is determined as the amount invested multiplied by the interest rate and the number of years that investment lasts.

I=PRT

I=interest

P=principal

R=rate of return

T=time

Let X be the amount invested at 6%

I at 6%=6%*X*1

I=0.06X

The amount invested at 10% is 20,000-X

total interest=0.06X+0.10*(20000-X)

total interest=1,480

1480=0.06X+0.10*(20000-X)

1480=0.06X+2000-0.10X

1480-2000=0.06X-0.10X

-520=-0.04X

X=-520/-0.04

X=13,000

13,000 was invested at 6%

amount invested at 10%=20,000-X

amount invested at 10%=20,000-13,000

amount invested at 10%=7,000

Find out more about simple interest on:brainly.com/question/20690803

#SPJ1

4 0
1 year ago
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