Problem: 27 men working 8 hours per day dig 30 m deep . how many extra men should be put to dig to a depth of 50 m working 6 hours per day ?
Rationale: "( 27 * 8 ) / 30 = ( x * 6 ) / 50 = > x = 60 60 – 27 = 33 answer : a"
annotated_formula: subtract(divide(multiply(divide(multiply(27, 8), 30), 50), 6), 27)