If the average of and is 30 the average of and is 20 then which of the following is are correct I Th...........

Quantitative Aptitude (CDS) Average

If the average of ?? and ?? is 30, the average of ?? and ?? is 20, then which of the following is/are correct?

I. The average of ?? and ?? must be greater than 25.

II. The average of ?? and ?? must be less than 25.

Select the correct answer using the codes given below.

Only I

Only II

Either I or II

Neither I nor II

Average of A and B = 30

$=>\frac{A+B}{2}\: =\: 30 =>\: A+B=60$

Average C and D = 20

$=>\frac{C+D}{2}\: =\: 20 =>\: C+D=40$

Here we can't find the average of B and C , A and D so that neither I nor II follows.

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