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 138 hats in this group, how many of these hats are not blue?
Choose the correct option:
A) 28  B) 42  C) 48  D) 96  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=138 or 23x=138...here 7x,4x and 12x represent hats of each type   23x=138 so x=6...Blue hats =7*6=42...Not blue will be   138-42= 
<gadget id="calculator">  138-42</gadget>
<output>96</output>
96.   Ans 96
<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 138 hats in this group, how many of these hats are not blue?