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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
they should learn HCFthe answer is 15 and not 12have not counted another 3

Ans 2:

Class : Class 5
C

Ans 3:

Class : Class 5

Ans 4:

Class : Class 7

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