Level 3
At the graduation ceremony, there were 30 less boys than girls. After 35 of the boys and 58 of the girls had left the hall for recess, there was an equal number of boys and girls that remained behind. Find the number of boys who were present at the graduation ceremony at first.
Level 3
At a book shop, Alice paid $22 for 5 items: 2 books and 3 pens. The total cost of 2 books is $6 more than the total cost of 3 pens. How much did 1 book cost?
Level 3
A sports cap and a badminton racket cost $48 altogether. The badminton racket costs $32 more than the sports cap. How much does the sports cap cost?