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1. Pour 7l of acid to 7l can.
2. Take out 3l from 7l can using 3l can. Now you have 4l acid in 7l can.
3. Take 10l acid in 10l can.
4. Remove 9l acid from 10l can using 3l can 3 times. Now you have 1l acid in 10l can.
5. Pour the 1l acid from 10l can to 7l can.
6. Now you have 5l acid in 7l can.

frar friend in the 10ltr can the acid is present from that you have to take 5ltr
It is not mentioned in the question. You just said there is a 10l and a 3l measuring can
iam sorry