Bob has hats: scarves=4: 3. during the day he sells 25 hats. at the end of the day he has hats: scarves=7: 9. work out the number of scarves he has.

Bob does not sell any scarves. (If he does, there isn't enough information here to solve the problem.) 

Suppose Bob ends the day with 7k hats and 9k scarves, where k is some integer. This is a ratio of 7:9. Bob started the day with 7k+25 hats and 9k scarves. The ratio at the start of the day is 
(7k+25)/9k = 4/3 
3(7k+25) = 4(9k) 
21k+75= 36k 
75 = 15k 
k = 5. 
So Bob has 9k = 9x5 = 45 scarves. 

Suppose Jake gets £ 1k and Kim gets £ 3k. Kim gets £ 2k more than Jake, so £ 2k = £ 9. 
Lee gets £ 6k = 3x £ 2k = 3x £ 9 = £ 27. 

The co-ordinates of X are 
x = 2 + (2/5)*(12.5-2) = 6.2 
y = 1 + (2/5)*(7.5-1) = 3.6.

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