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creativ13 [48]
3 years ago
15

The mean of three number is 15. if 2 of the numbers are 18 and 16 what is the third number​

Mathematics
1 answer:
MrMuchimi3 years ago
3 0

Answer:

11

Step-by-step explanation:

The mean is calculated as

mean = \frac{sum}{count}

let the third number be x , then

\frac{18+16+x}{3} = 15 ( multiply both sides by 3 to clear the fraction )

34 + x = 45 ( subtract 34 from both sides )

x = 11 ← third number

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Pipe A can fill a tank in 40 minutes, while pipe B takes 60 minutes to fill the same tank.
ella [17]

Answer:

24 minutes.

Step-by-step explanation:

This question shows up in a great many places in math or physics, so it is a pretty good question to learn how to do.

First you should note that answer will be under 40 minutes.

1/40 + 1/60 = 1/TimeTotal

The common denominator on the left is 120 minutes

3/40*3 + 2/60*2 = 1/timetotal

3/120 + 2/120      = 1/ timetotal

5/120 = 1/time total  Now to use to the key stop

What you do now is you always turn the left side over. You do the same thing to total time.

120/5 = total time

24 = total time

What this means is that if you let both pipes run for 24 minutes, they will fill the tank working together.

4 0
3 years ago
$10,000 is compounded semiannually at 12% interest for t years. what expression represents the amount of money after t years?
kari74 [83]
To solve this, you can do the is over of equals to % over hundred.
is         %
__ = ____
of      100
10,000      12
_____ = ____
    t           100
1,000,000=12t
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i hope this helps!
3 0
3 years ago
Algebra Nation Algebra 2 section 13 topic 4
8_murik_8 [283]
What is the question please?
4 0
3 years ago
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Write and graph exponential functions to model the number of students at school A and at school B as a function of number of yea
Westkost [7]

Answer:

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Step-by-step explanation:

8 0
3 years ago
A three-digit number ends in number 7. If you put the number 7 in the first position, the number will increase by 324. Find the
liq [111]

Answer:

<u>The original three-digit number is 417</u>

Step-by-step explanation:

Let's find out the solution to this problem, this way:

x = the two digits that are not 7

Original number = 10x+7

The value of the shifted number = 700 + x

Difference between the shifted number and the original number = 324

Therefore, we have:

324 = (700 + x) - (10x + 7)

324 = 700 + x - 10x - 7

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9x = 369

x = 369/9

x = 41

<u>The original three-digit number is 417</u>

5 0
3 years ago
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