Acan do a piece of work in 8 days. if b can do it in 10 days, in how many days can both working together do it? solution 1 let x= the required number of days, then = the part of the work both can do in 1 x day; 1 1 = the part of the work a can do in 1 day; = the part of the work b can do in 1 x x day: 1 1 1 9 = + , or x 8 10 10 40 4 solving, x = = 4 , the required number of days. 9 9 перевести