Answer:
11
Explanation:
Lets start with Jhon, in 4 years he will be 14.
To find Jhon's current age:
14-4 = Jhon 10 years old (current age)
We are also given: Riya is 6 years older than Jhon
10+6 = Riya 16 years old (current age)
Riya's age 5 years ago:
16-5 = Riya 11 years old (5 years ago)