A sports event has 180 athletes and 20 officials. Each person needs 1.5 liters of water. How much water is needed in total? Convert this to kiloliters. If water is stored in 2.5 kL tanks, how many ful

Total attendees = Number of athletes + Number of officials

$$\text{Total attendees} = 180 + 20 = 200$$

Each person is allocated 1.5 litres of water.

$$\text{Total water required} = \text{Total attendees} \times \text{Water per person}$$ $$\text{Total water required} = 200 \times 1.5 \text{ litres} = 300 \text{ litres}$$

The total amount of water required for all attendees is $\boxed{\text{300 litres}}$.

Question 1.1.2

We know that 1 kilolitre ($1 \text{ kL}$) is equal to 1000 litres ($1000 \text{ L}$).

$$\text{Total water in kL} = \frac{\text{Total water in L}}{1000}$$ $$\text{Total water in kL} = \frac{300 \text{ L}}{1000} = 0.3 \text{ kL}$$

The total water required in kilolitres is $\boxed{\text{0.3 kL}}$.

Question 1.1.3

The problem states that water is stored in tanks of 2.5 kilolitres each.

$$\text{Tank capacity in L} = 2.5 \text{ kL} \times 1000 \text{ L/kL} = 2500 \text{ L}$$

$$\text{Number of tanks} = \frac{\text{Total water required}}{\text{Capacity per tank}}$$ $$\text{Number of tanks} = \frac{300 \text{ L}}{2500 \text{ L/tank}} = 0.12 \text{ tanks}$$

Since we cannot have a fraction of a tank and we need to ensure all water is available, we must round up to the next whole number.
Therefore, the number of full water tanks needed is $\boxed{\text{1 tank}}$.

Question 1.1.4

From 1.1.3, we determined that 1 tank is needed.

$$\text{Total capacity of tanks used} = 1 \text{ tank} \times 2500 \text{ L/tank} = 2500 \text{ L}$$

$$\text{Unused water} = \text{Total capacity of tanks used} - \text{Total water required}$$ $$\text{Unused water} = 2500 \text{ L} - 300 \text{ L} = 2200 \text{ L}$$

The amount of water that will remain unused in the last tank is $\boxed{\text{2200 litres}}$.