A tank, when one-fifth full, holds 75 litres of water. How many litres will it hold when full?
(1/5)x = 75
x = 75/(1/5)
15
To solve this problem, we can set up a proportion using the given information.
Let's assume that when the tank is full, it holds 'x' liters of water.
According to the given information, when the tank is one-fifth full, it holds 75 liters of water. This means that one-fifth of the tank's capacity is equal to 75 liters.
So, the proportion can be set up as:
(1/5) * x = 75
To find the value of 'x', we can solve this equation.
Multiplying both sides of the equation by 5, we get:
x = 75 * 5
x = 375
Therefore, the tank will hold 375 liters of water when it is full.