Fast trick to find Average The Average marks of 13 student is 57. the average marks of 7 student is 61 and that of last 7 is 62 then find the marks of 7th student? Formula of Average : Average = (a + b)y - nx By Simple Method: average of 13 student is= 57 average of first 7 student is= 61 average of last 7 student is= 62 1 2 3 4 5 6 7 8 9 10 11 12 13 (7 * 61 + 7 * 62) - 13 * 57 7 (61 + 62) - 13 * 57 7 (123) - 741 861 - 741 120 By Fats Trick: For fast trick we put the values in the formula (a + b)y - nx (61 + 62) 7 - 13 * 57 (123) 7 - 741 861 - 741 120 so the marks of 7th student is 120. Watch Youtube video of Speed and Time for better understanding.
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