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HACTEHA [7]
3 years ago
12

The mean age of 5 people in a room is 40 years. A person enters the room. The mean age is now 40. What is the age of the person

who entered the room?
Mathematics
1 answer:
ad-work [718]3 years ago
6 0

Answer:

40

Step-by-step explanation:

5 people in the room have  5*40 = 200 years altogether

a new person is X years old.

Now 6 people have (200 + x) years altogether.

Mean age of 6 people  is (200+x)/6. and it is also = 40.

So,

(200+x)/6 = 40

200 + x = 240

x = 40

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If 40% is eliminated from 500 what is left over?
DIA [1.3K]

Answer:

300

Step-by-step explanation:

6 0
3 years ago
The Gilbert family bought airline tickets online. Each ticket cost $167. The Web site charged $19 per ticket, as well as a flat
PolarNik [594]
X  -  tickets
----------------------------------
167x + 19x + 16 = 1132
186x + 16 = 1132
186x = 1132 - 16
186x = 1116
x = 1116 : 186
x = 6 tickets (answer).
5 0
3 years ago
-6+3(2-4(-3)+6)+(-5)
FromTheMoon [43]

Answer:

43

Step-by-step explanation:

Remove parenthesis.

−6+3(2−4⋅−3+6)−5

Multiply −4 by−3.

−6+3(2+12+6)−5

Add 2 and 12.

−6+3(14+6)−5

Add 14 and 6.

-6+3(20)-5

Multiply 3 by 20.

-6+60-5

Add -6+60.

54-5

Subtract 54 and 5.

43

3 0
3 years ago
This is a number greater than one, which can only be divided by itself and one.
matrenka [14]

Answer:

Step-by-step explanation:

Well 7 is the only number that can be divided by itself and 1

6 0
3 years ago
Read 2 more answers
Al saves pennines. He agreed to give 6/13 of his pennines to Bev if she would give 6/13 of what she got from Al to Carl and if C
Anuta_ua [19.1K]

Answer:

24,167 pennies

Step-by-step explanation:

Let's see what happens if we say Al had 1000 pennies.

Bev would get 6/13 of 1000 which is  462 pennies. ((6/13)*1000)

Continuing like this Carl would get (6/13)*462 = 213

Dani would get 213(6/13)=98

Now, another way of writing this is 1000*(6/13)*(6/13)*(6/13).  hopefully that makes sense, if not let me know.

Anyway, what is another way of writing this?  If it isn't clear how else can you write 3*3*3*3?  Exponents is the answer.  3*3*3*3=3^4 and (6/13)*(6/13)*(6/13)= (6/13)^3, so you can write the whole equation as 1000(6/13)^3=98

Now, using the information given in the question we know how much is gotten by Dani as well as (6/13)^3, but we don't know how much we start with.  So instead of 1,000 like I showed lets use a variable x.

x*(6/13)^3 = 2376

Now you can use algebra to solve for x

x*(6/13)^3 = 2376 step one let's just figure out what (6/13)^3 is.

x*(216/2197) = 2376  Now here you can either divide by 216/2197 or multiply by 2197 then divide by 216, it's the same thing.

x = 24167

You can double check too with 24167*(6/13)^3

5 0
3 years ago
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