Subject :IMO Class : Class 5
The product of (672 ÷ 6) and 3rd multiple of 3 gives X. Taking away 378 from X gives Y. Find the sum of the common prime factors of X and Y.
A 7
B 10
C 12
D 9
Ans 1:
Class : Class 5
C
Ans 2:
Class : Class 9
Ans 3:
Class : Class 5
Ans 4:
Class : Class 9
they should learn HCFthe answer is 15 and not 12have not counted another 3