Question

Five men and eight women can do in ten days. Then three men and seven women do in 12 days. Then 11 men do in how many days

Answer 1

ans:-

let men be 1/x = u

women be 1/y=v

5/x+8/y=1/10.... 5u+8v=1/10.....(1)

3/x+7/y=1/12....3u+7v=1/12....(2)

be solving both ,and apply in 11/x gives number of days....