john and david can finish a job together in 2 hours . if john can do the job by himself in 3 hours , what percent of the job does david do ?
"you can also plug in numbers . for example , bob and alice work at a donut factory and make 18 donuts which is the job ( i picked this as a smart number ) . john on his own works 18 / 3 = 6 donuts per hour . john and david work 18 / 2 = 9 donuts per hour so david works 3 donuts / hour to find out the percentage , david works 3 donuts / hr x 2 hours = 6 donuts per hour . therefore 6 donuts / 18 donuts = 1 / 3 = 33.33 % answer : b"
multiply(subtract(2, inverse(3)), const_100)