Subject :IMO Class : Class 6
Rohan had a bag of balls. 
of them were green balls, 
of them were red balls, 15 were black balls and the remaining 48 were yellow balls. How many balls were in the bag?
A45
B63
C90
D108
I did not understand the method to solve this. Please tell me the method.
Ans 1:
Class : Class 6
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Ans 2:
Class : Class 6
Please respond fast.
Ans 3:
Class : Class 6
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Ans 4:
Class : Class 6
its too touch