1. In order to make Energade from a concentrate, it must be mixed wit water in a certain ratio. For every one litre of Energade concentrate, three litres of water is required. If I have to make fifty six litres of Energade for the derby day against the visiting team, how many lires concentrate do I need?

1. The ratio of concentrate to water is \( 1:3 \). 2. This means that for every litre of concentrate, the total volume of the drink is \[ 1 \text{ litre concentrate} + 3 \text{ litres water} = 4 \text{ litres total} \] 3. Let \( x \) be the number of litres of concentrate needed. Then the total volume produced using \( x \) litres of concentrate is \[ 4x \text{ litres} \] 4. We need to make \( 56 \) litres of Energade, so we set up the equation: \[ 4x = 56 \] 5. Solve for \( x \): \[ x = \frac{56}{4} = 14 \] 6. Therefore, you need \( 14 \) litres of concentrate.