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

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

Solution:

We can clearly say that "mean" has been used.

In this case, we are given three numbers, 12, x, and 18.

The marks obtained by the third student is 15 marks.

answer: the answer is 5/22

step-by-step explanation: if you subtract 17 from 22 the answer is 5 therefore the remainder of students are female

  the correct choice is marked

step-by-step explanation:

the first two graphs show multiple turning points. the last graphs matches the description in every detail.