a and b together can do a work in 4 days . a alone can do it in 20 days . what time b will take to do the work alone ?
"explanation : a and b 1 day ' s work = 1 / 4 a alone can do 1 day ' s work = 1 / 20 what time b will take to do the work alone ? b = ( a + b ) - a = ( 1 / 4 ) - ( 1 / 20 ) = 5 days answer : option e"
add(inverse(subtract(divide(const_1, 4), divide(const_1, 20))), divide(const_2, add(const_2, const_3)))