Level 3
The average cost of some books is $30.
When a book that costs $90 is removed,
the average cost of the books becomes $10.
How many books are there in the end?
Level 1
There are 3 boxes. The mass of Box A is 3.4 kg, the mass of Box B is 5.8 kg and the mass of Box C is 4.2 kg. Which box has its mass nearest to the average mass of the 3 boxes? Give the letter only for the answer.
Level 2 PSLE
A motorist travelled 23 of his journey at an average speed of 80 km/h and completed the remaining 240 km in 4 h. What was the total time taken for the whole journey?
Level 3
The average cost of some books is $30.
If 3 of the books are now each $15 more,
the average cost of the books becomes $35.
How many books are there altogether?
Level 2
A motorcycle rider travelled 45 of his journey at an average speed of 20 km/h and completed the remaining 60 km in 2 hours 45 minutes. How long did he take to complete his journey?
Level 3
The average cost of some books is $30.
If 3 of the books are now each $15 more and
2 of the books are now each $5 less,
the average cost of the books becomes $32.
How many books are there altogether?
Level 2
The average capacity of 3 containers is 35 ℓ. Given that the total capacity of two of the containers is 86 ℓ, what is the capacity of the third container?
Level 3
The average cost of some books is $10.
After 2 new books are added,
it adds another $60 to the total cost.
As a result, the average cost of all the books increases to $20.
How many books are there at first?