Question

In the following question there is a specific relationship between the first and second number. The same relationship exists between the third and the fourth number which will replace the question mark. Select the correct term from the alternatives given.
$7:50::9:?$

• A. $80$
• B. $66$
• C. $83$
• D. $64$

Answer 1

The correct option is D $64$

First pair of numbers $7:50$ follow pattern : where $2^{nd}$ isobtained by multipliyng $1^{st}$by $7$ and then adding $1$. i.e.

$7\times 7+1=50$

Similarly, $9\times 7+1=63+1=64$will be the next number of $2^{nd}$ pair.

Hence, $64$ replaces question mark.