a is half good a work man as b and together they finish a job in 15 days . in how many days working alone b finish the job ?
"c 45 / 2 wc = 1 : 2 2 x + x = 1 / 15 = > x = 1 / 45 2 x = 2 / 45 = > 45 / 2 days"
multiply(15, divide(const_3, const_2))