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oee [108]
3 years ago
6

45% of the population of a city are men

Mathematics
1 answer:
leonid [27]3 years ago
5 0

Answer:

\boxed{\textsf{ The number of children is \textbf{24150}.}}

Step-by-step explanation:

Given that the 45% of the population of a city are men and 15% are children . The number of women is 64,400 . And we need to find the number of children . Here ,

\sf\implies Percentage_{(men)}= 45/% .\\\\\sf\implies Percentage_{(children)}= 15\% .

So the percentage of women will be equal to [ 100 - ( 45 -15) ]% = [ 100 - 60 ]% = 40% .

So let us take the total number of people be x . So ,

\purple{\bigstar}\underline{\underline{\boldsymbol{ According\ to \ Question :- }}}

\sf\implies 40\% \ of \ x \ = \ 64,400 \\\\\sf\implies \dfrac{40x}{100}= 64,400 \\\\\sf\implies x =\dfrac{64,400\times 100}{40}\\\\\sf\implies \boxed{\pink{\sf x = 161,000 }}

\rule{200}2

<u>The </u><u>percentage</u><u> of</u><u> </u><u>children </u><u>=</u><u> </u><u>1</u><u>5</u><u>%</u><u> </u><u>:</u><u>-</u>

\sf\implies Number_{(children)}= 15\% \ of 161,000\\\\\sf\implies Number_{(children)}= \dfrac{15}{100}\times 161,000 \\\\\sf\implies \boxed{\pink{\frak {Number_{(children)}= 24150 }}}

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Answer:

55

Step-by-step explanation:

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DanielleElmas [232]

Answer:

so x = 4 and x = -2/3

Step-by-step explanation:

Solve for x using the Master Product:

3x^2-10x-8=0

we see   3*(-8) = -24   and  2 * (-12) = -24   and  2 + -12 = -10

so   3x^2  + 2x  -  12x  - 8 = 0

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so x = 4 and x = -2/3

7 0
3 years ago
B(7, 2) and C(-1,-9) are the endpoints of a line segment. What is the midpoint M of that line
Oksana_A [137]

Answer:

(3,-3.5)

Step-by-step explanation:

Mid-point formula : \frac{ x_{1} +x_{2}} {2}, \frac{y_{1}+y_{2}  }{2} \\\\x=\frac{7+(-1)}{2}         ,     y=  \frac{2+(-9)}{2} \\x= \frac{6}{2}              ,     y=  \frac{-7}{2} \\x=3                             ,    y= -3.5

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4 0
4 years ago
Two planes start from los angeles international airport and fly in opposite directions. the second plane starts 1/2 hour after t
mixer [17]
Let x = first plane's speed.  
We have the equation:
 2 hours * x km/h + 1.5 hours * (x+60) km/h = 3135 km. 
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6 0
4 years ago
If 80 persons can perform a piece of work in 16 days of 10 hours each, how
eduard

Answer:

The number of men needed to perform a piece of work twice as great in tenth part of the time  working 8 hours a day supposing that three of the second set can do as much  work as four of the first set is:

  • <u>1200 men</u>.

Step-by-step explanation:

To find the answer, first, we're gonna find how many hours take to make the piece of work in 16 days, taking into account each day just has 10 hours:

  • Number of hours to make a piece of work = 16 * 10 hours
  • Number of hours to make a piece of work = 160 hours.

Now, we divide the total hours among the number of persons:

  • Equivalence of hours per person = 160 hours / 80 persons.
  • Equivalence of hours per person = 2 hours /person

This equivalence isn't the real work of each person, we only need this value to make the next calculations. Now, we have a piece of work twice as great as the first, then, we can calculate the hours the piece of work needs to perform it (twice!):

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We need to make this work in tenth part of the time working 8 hours a day, it means:

  • Time used to the second work = 320 hours / 10
  • Time used to the second work = 32 hours
  • Time used to the second work = 32 hours / 8 hours (as each day has 8 hours)
  • Time used to the second work = 4 days

Now, we know three of the second set can do as much  work as four of the first set, taking into account the calculated equivalence, we have:

  • Work of four workers of first set = Work of three workers of second set
  • Work of four workers of first set = Equivalence * 4 persons.
  • Work of four workers of first set = 2 hours /person * 4 persons
  • Work of four workers of first set = 8 hours.

So, three persons of the second set can make a equivalence of 8 hours. At last, we calculate all the number of workers we need in a regular time:

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Remember we need to perform the job not in a regular time, we need to perform it in tenth part of the time, by this reason, we need 10 times the number of people:

  • Number of needed workers in tenth part of the time = 120 persons * 10
  • <u>Number of needed workers in tenth part of the time = 1200 persons</u>

With this calculations, <em>you can find the number of men needed to perform a piece of work twice as great in tenth part of the time  working 8 hours a day supposing that three of the second set can do as much  work as four of the first set is </em><u><em>1200 persons</em></u>.

4 0
3 years ago
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