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Books on a shelf

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?

Age Difference

Sam is 3 years older than his sister Priya. In 5 years' time, the sum of their ages will be 35. How old is Priya now?

Sharing sweets

 Ben has a bag of 40 sweets. He eats 2/5 of them on Monday and 1/4 of what is left on Tuesday. How many sweets does he have left?

Saving up

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?

Average speed

 A cyclist travels 15 km in 45 minutes. What is her average speed in km/h?

Distance on a map

A map has a scale of 1:50,000. If two towns are 8 cm apart on the map, what is the real distance in kilometres?

Percentage problems

In a class of 30 students, 40% are boys. How many girls are there?