1. A farmer can put up a fence - of a km in 1 day. What is the length of the fence that he can put up in 6 2/3 days

20km

Step-by-step explanation:

Given that it takes a farmer 1 day to put up ⅓km fence, the length of fence he would put up in 6⅔ days would be calculated as follows:

Let x be length of the fence we are looking for. Thus,

⅓ km = 1 day

6⅔ = x

Cross multiply

⅓*x = 1*6⅔

⅓*x = 1*20/3

x/3 = 20/3

Multiply both sides by 3 to make x the subject of formula

x = (20*3)/3

x = 20

Length of fence he would put up in 6⅔ days = 20km