Question 87633
 1 1/2 = 3/2

4 1/2 = 9/2

Let x be the amount of water needed.
we will ratio and proportion, their ratio should be the same
   
{{{(3/2)/(9/2) = (3/4)/x}}}

after simplification, it changes to

{{{1/3 = 3/4x}}}


Now cross multiply

1 x 4x = 3 x 3

4x = 9

divide both sides by 4

x = 9/4 or 2 1/4

so Answer is C