Money left after buying first packet of rice = 210 - 50
= ₹160
Money left after buying second packet of rice = 160 - 50
= ₹110
Money left after buying third packet of rice = 110 - 50
= ₹60
Money left after buying fourth packet of rice = 60 - 50
= ₹10
No more rice packets can be bought with ₹10.
So, 4 packets can be bought with ₹210.