Problem: what is the smallest number which , when increased by 9 , is divisible by 7 , 8 , and 24 ?
Rationale: "lcm ( 7 , 8,24 ) = 24 x 7 = 168 so the least divisible number is 168 , and the number we are looking for is 168 - 9 = 159 . the answer is c ."
annotated_formula: subtract(lcm(24, 8), 9)