Question

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 students​

Answer 1

Answer:

The third student obtained 15 marks.

Step-by-step explanation:

Let the marks obtained by the third student be x.

$\frac{12 + 18 + x}{3} = 15 \\ \frac{30 + x}{3} = 15 \\ 30 + x = 45 \\ x = 45 - 30 = 15$

Answer 2

15*3 = 45
45 - (12+18)
45 - 30
15 Answer