Rishab Murthy
from
Birla Public School , Doha
Subject :IMO Class : Class 5
I think of a decimal number. After I have subtracted 2.9 from it, multiplied the result by 3 and then added 0.15, I get 10.5. What decimal number I am thinking of?
A 4.5
B 15.66
C 20.10
D None of these