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
viva [34]
3 years ago
13

The average marks obtained by three students is 15. If two students obtained 12 and 18 marks respectively, find the marks obtain

ed by the third student.​
Mathematics
2 answers:
SOVA2 [1]3 years ago
4 0

Answer:

15 marks

Step-by-step explanation:

If the average mark obtained by 3 students is 15, then the total marks are

⇒ 3 x 15 = 45

Let x be the marks obtained by the third student.

If two students obtained 12 and 18 marks, then

⇒ 12 + 18 + x = 45

⇒ 30 + x = 45

⇒ x = 45 - 30

⇒ x = 15

dmitriy555 [2]3 years ago
4 0

Solution:

<u>We can clearly say that "mean" has been used.</u>

  • Mean is the average of a group of numbers.

In this case, we are given three numbers, <u>12, x, and 18.</u>

  • => 12 + 18 + x/3 = 15
  • => 30 + x = 3 x 15
  • => 30 + x = 45
  • => x = 45 - 30
  • => x = 15

The marks obtained by the third student is <u>15 marks.</u>

You might be interested in
Andre pays $13 for 3 books. Diego bought 12 books priced at the same rate. How much did Diego pay for the 12 books? Explain your
sergeinik [125]

Answer:he would pay 156

Step-by-step explanation:i did the math

6 0
3 years ago
A college student has a new job, and must balance classes and commute times to work. The student takes two weeks to drive from c
ArbitrLikvidat [17]

Answer: average time in minutes that it will take to drive from campus to workplace

Step-by-step explanation:

The dependent variable refers to the variable that the researcher is testing or measuring in an experiment. Let's say for example, we want to know the impact of reading on the examination score of a student. In this case, the dependent variable will be the examination score of the student since that's what we're measuring.

With regards to the question, the dependent variable is average time in minutes that it will take to drive from campus to workplace.

7 0
3 years ago
Many grandparents invest in the stock market for their grandchildren's college fund. Eighteen years ago, your grandparent jumpin
Tcecarenko [31]

Answer:

jejrjrjroroowwkkekf

6 0
4 years ago
If DE is congruent to KR and O is the midpoint of ER and DK, which of the following congruence postulates can be used
Deffense [45]

Answer:

ASA

Step-by-step explanation: I'm not sure I had just found a key.

6 0
3 years ago
How would you solve this?? i need to understand the process to theses types of problems!!
Evgen [1.6K]

Answer:

  CD = 10√3

Step-by-step explanation:

First of all, you need to understand the terms. The <em>incenter</em> is the center of an inscribed circle. Such a circle is tangent to all three sides of the triangle at points B, D, and F. The distances BG, DG, and FG are each the radius of the circle.

The diagram shows FG = 22, so that is also the measure of DG. This gives you two of the three sides of right triangle CDG, so you know enough to apply the Pythagorean theorem.

  CG^2 = CD^2 + DG^2

  28^2 = CD^2 + 22^2

  300 = CD^2 . . . . . . . . subtract 22^2

  10√3 = CD . . . . . . . . . take the positive square root

The measure of CD is 10√3.

_____

The process is to understand the geometric relationships and what they mean regarding the algebraic relationships. Then you use the algebraic relationships to write equations that let you find the unknowns you seek.

8 0
3 years ago
Other questions:
  • Help with the following problem
    15·1 answer
  • What is the vertex of a parabola defined by the equation x = 5y2?
    10·1 answer
  • 19/24 as a decimal rounded to the nearest hundredth
    6·2 answers
  • Solve the equation. Then check your solution.
    8·2 answers
  • Glenn needs to cut pieces of a lanyard that are each 1 meter long to make lanyard key chains. If he has 3 pieces of lanyard that
    8·1 answer
  • Construct a confidence interval of the population proportion at the given level of confidence. x =860​, n =1100​, 96​% confidenc
    8·1 answer
  • Help me please, i am terrible at math
    11·2 answers
  • Scatter plots: line of best fit write the equation in slope-intercept form. Write any coefficients as integers, proper fractions
    10·1 answer
  • Phil invests $300 dollars at an interest rate of 4% over 5 years. If his investment is
    5·1 answer
  • Solve for each variable. Remember to SHOW YOUR WORK! <br> 3(4n − 2) = 2n + 74
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!