A water tank containing water of dimensions 5mx4mx2m if small carts carried 1.5m3 how many carts are needed to empty the tank?

First, calculate the volume of the water tank: (5 \text{m} \times 4 \text{m} \times 2 \text{m} = 40 \text{m}^3). Next, divide the total volume of the tank by the capacity of each cart: (40 \text{m}^3 \div 1.5 \text{m}^3 \approx 26.67). Since you cannot have a fraction of a cart, you would need 27 carts to empty the tank completely.