Three numbers A,B,Care in ratio 1:2:3. Their average is 600. If A is increased by 10% and B is increased by 20%, then to get the average increased by 5%, C will increased by:  Choices.
A) 90
B) 100
C) 150
D) 180
E) 190
Let be A= x, B=2x, and C=3x.   (x+2x+3x)/3=600   this will be x=300   so, the numbers will be 300,600,900   new average= 105%of 600= 630   Let 110% of 300+80% of 600 + y= 630*3   solve it for y, you will get, y=1080   so, increase in C= 1080-900= 
<gadget id="calculator">1080-900</gadget>
<output>180</output>
180 ans   ANSWER:180
<result>D</result>
Three numbers A,B,Care in ratio 1:2:3. Their average is 600. If A is increased by 10% and B is increased by 20%, then to get the average increased by 5%, C will increased by: