Problem: a block of wood has dimensions 10 cm x 10 cm x 40 cm . the block is painted red and then cut evenly at the 20 cm mark , parallel to the sides , to form two rectangular solids of equal volume . what percentage of the surface area of each of the new solids is not painted red ?
Rationale: "the area of each half is 100 + 4 ( 200 ) + 100 = 1000 the area that is not painted is 100 . the fraction that is not painted is 100 / 1000 = 1 / 10 = 10 % the answer is b ."
annotated_formula: multiply(divide(const_100, add(add(multiply(multiply(const_4, const_100), const_4), const_100), const_100)), const_100)