Trisha needs 41/2 yards of fabric to do a project. if she already has2/3 of a yard of fabric, what is the minimum amount of fabric she must buy to be able to complete her project?

We know that
4 1/2> (4*2+1)/2> 9/2
(2/3)*(9/2)> 18/6>3 yd  (this is what Trisha has )
if she has (2/3) she only needs (1/3)

[the minimum amount of fabric she must buy]=(9/2)*(1/3)=1.5 yd

the answer is 
the minimum amount of fabric she must buy is 1.5 yd

20000 as first it increases by 2500 then by 5000 so next it will increase by 10000

There is 240 red cars and there is 400 blue cars because 240/3=80 and 80*5=400