a can finish a piece of work in 5 days . b can do it in 10 days . they work together for 1 day and then a goes away . in how many days will b finish the work ?
"1 / 5 + ( 1 + x ) / 10 = 1 = > x = 7 days answer : d"
divide(subtract(const_1, add(multiply(divide(const_1, 5), const_2), multiply(divide(const_1, 10), const_2))), divide(const_1, 10))