Amara has saved £45 towards a new bicycle that costs £120. She saves an extra £7.50 each week from her pocket money. After how many weeks will she have saved enough money to buy the bicycle?
A shelf holds 96 books. Two-thirds of the books are fiction and the rest are non-fiction. If 18 of the non-fiction books are then donated to charity, how many non-fiction books remain on the shelf?
Amir is saving for a bike that costs £84. He has already saved £36, and plans to save £6 each week from his pocket money. How many more weeks will it take him to save enough to buy the bike?