Correct Answer - Option 2 : 115
Total number of families = 200
1. 70 have a car each but have no bike.
2. 50 families have a bike and a car each
3. 65 families have only a bike each.
The remaining families have neither a car nor a bike.
Number of bikes in the housing society in all = Number of families that have a bike and a car each + Number of families that have only a bike each
= 50 + 65
= 115
Hence, ‘115’ is the correct answer.