Lord of all, in this problem, three pairs of numbers are connected through a mathematical operation to a common answer. What is the missing number? 4,5,6, 10, 12,15

8

Step-by-step explanation:

Hi, to answer this question we have to analyze the sequence given:

4, 5, 6, 10, 12, 15

So, the rule of the sequence is that at the third time adding values  , we are adding a unit more:

The missing number is 8.

Feel free to ask for more if needed or if you did not understand something.

mean, 40.6

step-by-step explanation: