Question

13.
The average marks of 27 students is 18. If the average
marks of first 13 students is 16 and that of last 13
students is 17, then find the marks of 14 student.
A. 55
B. 57
C. 54
D. None of these​

Answer 1

Answer:

answer will be 57

Step-by-step explanation:

total marks of 27 students will be 27*18=486

since first 13 students average marks is16, so total marks of 13 students will be 13*16=208

again last 13 students average marks is 17, so total marks of last 13 students will be 13*17=221

so marks of 14th student will be 486-(208+221)

=486-429

=57 marks

Answer 2

Answer:

this is

class 8 Olympiad question.

27 X 18 =486

16 X 13=208

13 x 17 = 221

486 - 208 +221

486-429

57

= 57