3 years ago

4(1+4m) + 7(8-7m) =27

Mathematics

1 answer:

Xelga [282]3 years ago

8 0

Answer = m=1

Thank you !

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One pipe fills a storage pool in 20 hours, another pipe fills the same pool in 15 hours.

erica [24]

X=time of the third person it would take to fill the pool
We can suggest this equation:
6[(1/20) + (1/15) +(1/x)]=1
6[(3x+4x+60)/60x]=1
(7x+60)/10x=1
7x+60=10x
7x-10x=-60
-3x=-60
x=-60/-3
x=20

Answer: the third person alone would fill the pool in 20 hours .

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3 years ago

A bucket holds 2 gallons of water. If you pour out 1/4 of the water, how many gallons of water do you have left in the blucket?

amid [387]

The answer is 1.75.

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4 years ago

A total of $6000 was invested, part of it at 3% interest and the remainder at 8%. If the total yearly interest amounted to $380,

Nastasia [14]

$ 2000 is invested at 3 % interest and $ 4000 is invested at 8 % interest

Solution:

Given that, total of $6000 was invested

Let "x" be the amount invested at 3 % interest

Then, (6000 - x) is the amount invested at 8 % interest

Given that,

The total yearly interest amounted to $380

Then, we can frame a equation as:

$x \times 3 \% + (6000 - x) \times 8 \% = 380$

Solve the above expression for "x"

$x \times \frac{3}{100} + (6000-x) \times \frac{8}{100} = 380\\\\0.03x + (6000-x) \times 0.08 = 380\\\\0.03x + 480 - 0.08x = 380\\\\-0.05x = -100\\\\\text{Divide both sides by -0.05 }\\\\x = 2000$

Thus, $ 2000 is invested at 3 % interest

(6000 - x) = 6000 - 2000 = 4000

$ 4000 is invested at 8 % interest

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Answer:

1. 15.75

2. $236.25

Step-by-step explanation:

3.5 *4.5= 15.75 square yards

15.75*15=236.25

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2 years ago

Read 2 more answers

I’ll post part one but plz help it’s worth 15POINTS I’ll mark as Well!!!!

olasank [31]

Answer:

Wellll

Step-by-step explanation:

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3 years ago