In a group of hats consisting of only blue hats, green hats, and purple hats, the ratio of blue hats to green hats to purple hats is 7:4:12. If there are a total of 184 hats in this group, how many of these hats are not blue?	Choose the correct option.
A) 28  B) 42  C) 48  D) 128  E) 76
Since the hats Blue, Green and Purple are in ratio of 7:4:12...The total no. of balls will be   7x+4x+12x=184 or 23x=184...here 7x,4x and 12x represent hats of each type   23x=184 so x=8...Blue hats =7*8=56...Not blue will be   184-56= 
<gadget id="calculator">  184-56</gadget>
<output>128</output>
128.   Ans 128
<result>D</result>
In a group of hats consisting of only blue hats, green hats, and purple hats, the ratio of blue hats to green hats to purple hats is 7:4:12. If there are a total of 184 hats in this group, how many of these hats are not blue?