Level 3
A fruit seller had 750 durians and 540 watermelons. After selling some durians and watermelons, he had 523 durians and 225 watermelons left. What was the total number of fruits sold?
Level 2
There are 5 pupils on my left.
There are 6 pupils on my right.
There are 7 pupils in front of me.
There are 8 pupils behind me.
How many pupils are there altogether?