The average marks obtained by 22 candidates in an examination are 45. The average marks of the first ten are 55 and that of the last eleven are 40. The number of marks obtained by 11th candidate is
(a) 0 (b) 45 (c) 47.5 (d) 50
The average marks obtained by 22 candidates in an examination are 45. The average marks of the first ten are 55 and that of the last eleven are 40. The number of marks obtained by 11th candidate is
(a) 0 (b) 45 (c) 47.5 (d) 50