A milk vendor sold 25 / 200 ml, 15 / 500 ml and 9 / 750 ml of milk in three successive days. How many litres of milk did she sell in all three days ?

Correct option is B

Given:
Milk sold on day 1: 25 L 200 ml
Milk sold on day 2: 15 L 500 ml
Milk sold on day 3: 9 L 750 ml

Formula Used:
Total milk sold = Sum of milk sold on all three days
​$$1~L=1000~ml$$​​

Solution:
Convert the given quantities into decimals (litres) or add litres and millilitres separately.
Adding litres:25+15+9=49
Adding millilitres:
200+500+750=1450
Convert the total millilitres into litres and millilitres:
1450~ml=1~L+450~ml
Add this to the total litres calculated earlier:
Total~Litres=49+1
Total~Litres=50
The remaining millilitres are:
450~ml
So, the total amount of milk sold is 50 L 450 ml.

Final Answer
So the correct answer is (b)