A vessel has 4 litres 500 millilitres of orange juice. In how many glasses, each of 25 mL capacity, can it be filled?

Total amount of orange juice = 4 L 500 mL

= (4 × 1,000 + 500) mL

= 4,500 mL

Capacity of each glass = 25 mL.

Number of glasses = $\dfrac{\text{Total amount of juice}}{\text{Capacity of each glass}}$

= $\dfrac{4{,}500 \text{ mL}}{25 \text{ mL}}$

= 180

Hence, the orange juice can be filled in 180 glasses.