Answer: The number of novels he read in 13 months = 78.
Explanation:
Given : Manuel needs to read 6 novels each month.
i.e. In One month , the number of novels read by Manuel = 6
Let N be the number of novels Manuel needs to read in M months.
Then , N = 6 M
Thus , the equation relating N to M : N = 6 M
If Number of months = 13 , then put M = 13 in the above equations , we get

Hence, the number of novels he read in 13 months = 78.