johnsonjermille9
johnsonjermille9 johnsonjermille9
  • 20-01-2021
  • Mathematics
contestada

The average age of three people running for election is 42. A fourth person joins the race and the average drops to 40. What is the fourth person's age?​

Respuesta :

BigBrainBigMuscle
BigBrainBigMuscle BigBrainBigMuscle
  • 20-01-2021

Call the four people [tex]abc[/tex] and [tex]d[/tex].

We know:

[tex]\frac{a+b+c}{3}[/tex][tex]=42[/tex]

and

[tex]\frac{a+b+c+d}{4}[/tex][tex]=40[/tex]

Thus:

[tex]a + b + c = 126[/tex]

[tex]\frac{126+4}{4} = 40[/tex]

[tex]126 + d =160[/tex]

[tex]d = 34[/tex]

Answer Link

Otras preguntas

I need help on this question
The law of states that traits are passed from parents to offspring independently of one another.. True or false
Please help me ASAP!! I'm so confused...
Please help!! Need today! Will get brainliest for right answer! Compare and contrast absolute advantage and comparative advantage.
Which of the following describes a compound? (Hint: Carbon and oxygen bo A. a piece of pure carbon, containing only carbon atoms B. oxygen gas surrounding a sol
Which of the following was NOT a major animal on land during the Carboniferous period? amphibians insects both a and b none of the above
State the vertical asymptote of the rational function. f(x) = quantity x minus nine times quantity x plus seven divided by quantity x squared minus four.
1/2 plus 3/4 please helpppp
On a coordinate grid Ming's house is located 2 blocks to the right and 5 blocks up from (0,0). Joe house is located 3 blocks to the right and 2 blocks down from
Which of the following is likely NOT involved in this example of ecological succession? A) The rotting remains of plants add to the fertility of the soil. B)The