Problem: how many figures are required to number the pages the pages of a book containing 223 pages ?
Rationale: "1 to 9 = 9 * 1 = 9 10 to 99 = 90 * 2 = 180 100 to 223 = 124 * 3 = 372 - - - - - - - - - - - 561 answer : c"
annotated_formula: add(add(subtract(divide(divide(223, const_10), const_10), const_1), subtract(subtract(divide(223, const_10), const_1), subtract(divide(divide(223, const_10), const_10), const_1))), multiply(subtract(subtract(223, const_1), subtract(divide(223, const_10), const_1)), const_3))