Bheja fry question

 We have to find the missing number.

4        8        24

3         6        18

5        10        ??

In these type of questions, we need to observe both rows and columns. 

While observing rows, we can not think of any logic behind the numbers. 

But in columns, 

Second column  =   2  *  first column number

Third column  =    3   *    second column number

Finally we can write, 

2       4        12

3       6         18

5      10        30