Pranay saw a pattern in the lotus petals.

Find the missing number in the pattern to get the total number of petals.

The correct option is C 10
The numbers on left hand side are 10, 20, 30.
The number on right hand side are 20, 30, 40.

Observing these numbers on a number line, we get:

We can see that $10$ is being added everytime to numbers on the left hand side to get numbers on the right hand side.

So, the pattern can be represented as:


So, the pattern follows the pattern "add 10".