Problem: if the number 872 , 152,24 x is divisible by 11 , what must be the value of x ?
Rationale: "multiplication rule of 11 : ( sum of digits at odd places - sum of digits at even places ) should be divisible by 11 given number : 872 , 152,24 x sum of digits at odd places = 8 + 2 + 5 + 2 + x = 17 + x ( i ) sum of digits at even places = 7 + 1 + 2 + 4 = 14 ( ii ) ( i ) - ( ii ) = 17 + x - 14 = x - 3 hence x should be = 3 to make this a multiple of 11 ( 0 ) option c"
annotated_formula: multiply(multiply(multiply(add(multiply(const_3, const_10), const_1), const_2), const_4), 11)