1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Ira Lisetskai [31]
2 years ago
13

The mean age of a group of students is 16. John joins the group and the mean age changes to 18. How old is john ?

Mathematics
1 answer:
schepotkina [342]2 years ago
5 0

Answer:

John is 20 years old.

Step-by-step explanation:

Given the second mean is 18, it is equal to the first mean age plus John's unknown age. The sum is also divided by 2 because there are 2 values in the sum (1. John's age and 2. the mean, 16 yrs old).

Set up an equation: \frac{x+16}{2}=18

multiply both sides by 2: x+16=36

simplify: x=20

You might be interested in
Jenny has a bag of jelly beans. Of all the jelly beans Jenny has there are a total of 20. If 13 of those jelly beans are green,
Sindrei [870]

Answer:

65% are green

Step-by-step explanation:

13 is 65% of 20

8 0
2 years ago
Students were packed shoulder to shoulder in a gym for a pep rally. The students were in a rectangular shaped area of 7,500 ft2.
hram777 [196]

Answer: 1527

Step-by-step explanation:

Total Area = 7500 ft^2

Area covered by one student = Area of one circle

                                                   = π*r^2

r = radius of circle = 2.5/2 = 1.25 ft

Area covered by one student = π*1.25^2 = 4.91 ft^2

Number of students who can fit into total area = Total Area/Area covered by one student

Number of students who can fit into total area = 7500/4.91 = 1527.49

Hence the answer is 1527 students

7 0
3 years ago
What is 49% of $201.13
Nookie1986 [14]

Answer:

98.5537

Step-by-step explanation:


8 0
3 years ago
Read 2 more answers
BRAINLIEST <br>if -x = x -6 then x = <br>A. -6<br>B. -3<br>C. 0<br>D. 3<br>explain please​
Paul [167]

Answer:

D or 3

Step-by-step explanation:

The equation you are saying is

-x = x-6

If you move both x's to one side, you get

-2x = -6

From this, you can simplify by dividing by -2

x=3, or D.

Hope this helped!

5 0
3 years ago
Mira has $760 in her bank account and withdraws $40 each month. Paulina has $210 in her bank account and deposits $70 each month
Taya2010 [7]
A. 5

                    1st  2nd  3rd  4th 5th    Month
_________________________________

Mira:760      720-680-640-600-560

Paul
ina  :210      270-340-410-480-560
3 0
2 years ago
Other questions:
  • Solve the equation. Select the correct choice below and if necessary, fill in the answer box to complete your choice. The soluti
    9·1 answer
  • Find the exact area of the circle with circumference = 30pi
    10·1 answer
  • Let A = any rational number is the absolute value of a different if A is a positive number or negative number Explain
    5·1 answer
  • Please help me i only have 30 mins to an hour to finish
    8·1 answer
  • Right answer gets brainlist
    6·1 answer
  • Can you help me please
    8·1 answer
  • Y – 1.02 = 4.7 <br> solve for y
    13·2 answers
  • What is the slope-intercept equation of the line below?
    6·1 answer
  • Help pls/plz/plx/plszx
    14·2 answers
  • Find the slope of the line:
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!