The average of 13 numbers is 42. If a 14th number is included, then the average becomes 44. What is the 14th number?

70 62 66 68

70

Total Sum of 13 numbers = 13 × 42 = 546 Total Sum of 14 numbers = 14 × 44 =  616 14th number is = 616 - 546 = 70