The diagram shows a fuel gauge in a car.
(a) what fraction does the gauge show?
(b) the fuel tank holds 48 litres when it is full. how many litres must be added to fill the tank?

The fuel gauge shows  3/8  full.  (actually  6/16  but simplified)

So the other  5/8  of the tank is empty.

In order to fill the tank, you'll have to pour in  5/8  of  48 liters.

Can you handle it from there ?

Part a)

Part b)

Step-by-step explanation:

Part a)  What fraction does the Gauge show?

we know that

Each division in the Fuel gauge represent the fraction

so

To find what fraction the gauge shows multiply by

Part b) The fuel tank holds 48 litres when it is full. How many Litres must be added to fill the tank?

we know that

The tank has of its total capacity

so

To fill the tank must be added

therefore

Multiply by

4x=-x+10
5x=10
x=2
y=4x
y=8
(2,8)