Level 3
The average cost of some books is $75. When another 3 books are added, the total cost increases by $190. The average cost becomes $70. How many books are there in the end?
Level 2
Terry bought 10 cans of Coke, 20 cans of Sprite and some Pepsi. Given that 40% of the drinks Terry bought were Pepsi, how many cans of Pepsi did he buy?
Level 2
The sides of a triangle are in the ratio 5 : 2 : 3. The length of the longest side is 20 cm. Find the length of the shortest side of the triangle.
Level 2
There were 40 more dresses than blouses in a shop. After 70 dresses and 30% of the blouses were sold, there were an equal number of dresses and blouses left. How many blouses were there in the shop at first?
Level 3
The average cost of some books is $30.
When a book that costs $90 is added,
the average cost of the books becomes $40.
How many books are there in the end?
