Problem: the average of 5 numbers is 6.8 . if one of the numbers is multiplied by a factor of 4 , the average of the numbers increases to 9.2 . what number is multiplied by 4 ?
Rationale: "the average of 5 numbers is 6.8 the sum of 5 numbers will be 6.8 x 5 = 34 the average of 5 number after one of the number is multiplied by 4 is 9.2 the sum of the numbers will now be 9.2 x 5 = 46 so the sum has increased by 46 - 34 = 12 let the number multiplied by 4 be n then , 4 n = n + 12 or 3 n = 12 or n = 4 answer : - d"
annotated_formula: subtract(multiply(9.2, 5), multiply(6.8, 5))