What is the cost of 4 such water bottles ?
The cost of each bottle is ₹9 and we have to find the cost of 4 bottles.
The total cost of 4 bottles = ₹9 × 4
9 × 4 = 5 × 4 + 4 × 4
= 20 + 16
= 36
Thus, the cost of 4 bottles is ₹36.