According to Fundamental principal of counting ,we known that
If a operation can be performed in ways ,and if corresponding to each of the ways of performing this operation,there are ways of performing a second operation, then the number of ways of performing the two operations together is .
Here, there are 5 different routes from Tanay house to mall.
And 8 routes from mall to water park.
Clearly, corresponding to each of the 5 different routes from Tanay house to mall there are 8 routes from mall to water park.
Therefore , the total number of routes from Tanay's house to water park .
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