Question

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

Answer 1

Answer: 15

Step-by-step explanation:

Average = Sum of the numbers/ total number of numbers

Let the marks obtained by the 3rd student be x. Then,

(12 + 18 + x)/3 = 15

30 + x = 45

x = 15