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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>

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