Question

40 men can finish a poece of work in 26 days . how many men will be needed to finish it in 16 days

Answer 1

26 days = 40 men
.:.1 day = 40/26 men
.:.16 days = 40/26 x 16 men
.:.16 days = 320/13 men
                 

Answer 2

You can solve it simply by UNItARY MEtHOD:

Work days 26 = Men 40
If:
Wok days 16 = Men x

You can calculate x by cross multiplicaion as:

16*40 = x*26

then x = (16*40) ÷ 26 

You can use a calculator to get answer