Level 2
Samantha scored a total of 98 marks for her History and Geography tests and a total of 130 marks for her Chinese and English tests. What was her average marks for the 4 subjects?
Level 2
There are 8 boys and 12 girls in a class. If each boy gets 15 sweets and each girl gets 20 sweets, what is the average number of sweets each child gets?
Level 3
William had some coins. 40% of his coins were made up of 50-cent coins which was equal to the number of $1 coins. The rest of the coins were made up of 20-cent coins. Given that William had $16 more 50-cent coins than 20-cent coins, how many coins did William have altogether?