Question

You have a 5 litre Cup and a 3 litre Cup and an unlimited supply of water. You need to measure exactly 4 litres of water but there is no measuring instrument or cup.
Also, the cups don't contain any marks.
How will you go about it?
Answer this question ASAP. Thanking you in advance.

Answer 1

Dear Student,

Step1: Fill the 5 litre cup from the tap.

Step2: Take out 3 litre from it by using an empty 3 litre cup.

Step3: Pour away the contents of 3 litre cup.

Step4: Transfer the 2 litre from the larger cup to the smaller one cup.

Now the larger cup is empty and the smaller cup has 1 litre free space.

Step5: Fill the 5 litre cup again from the tap.

Step6: Transfer some litres from the larger cup(5 litres) to the smaller cup (2 litres) till it gets totally full.

Step7:Now the 5 litre cup is containing 4 litre because the 1 litre is transferred to the smaller cup.

Regards