Problem: a certain fraction has the same ratio to 1 / 36 , as 4 / 5 does to 2 / 9 . what is this certain fraction ?
Rationale: "x / ( 1 / 36 ) = ( 4 / 5 ) / ( 2 / 9 ) x = 4 * 9 * 1 / 36 * 5 * 2 = 1 / 10 the answer is b ."
annotated_formula: divide(1, 36)