21 P5.ST.JC.18121204
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?
3 m
2 averages Averaging out Average with unknown quantity Number x value Units equations Units table
22 P5.ST.JC.18121205
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?
3 m
2 averages Averaging out Average with unknown quantity Number x value Units equations Units table
23 P5.ST.JC.18121206
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?
3 m
2 averages Averaging out Average with unknown quantity Number x value Units equations Units table
24 P5.ST.JC.18121207
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?
3 m
2 averages Averaging out Average with unknown quantity Number x value Units equations Units table
25 P5.ST.JC.18121208
Level 3
The average cost of some books is $30.
After 2 new books are added,
it adds another $10 to the total cost.
As a result, the average cost of all the books decreases to $20.
How many books are there at first?
3 m
2 averages Averaging out Average with unknown quantity Number x value Units equations Units table
26 P4.DA.JM.17092712
Level 2
The table shows the number of books the children had borrowed. A total of 50 books were borrowed by the children.
  1. How many children borrowed 3 books or less?
  2. How many children borrowed 5 books?
3 m
Table Number x value
27 P5.RA.JC.17122908
Level 2
Reena had 50-cent and 20-cent coins in the ratio of 4 : 5. The total value of the coins was $12. How many 50-cent coins did Reena have?
2 m
W Multiplication & division Money Unit conversion Number x value Units method
28 P6.DA.NK.21060937
Level 2
The average height of some children is 160 cm. There is an equal number of boys and girls. The average height of the boys is 170 cm. Find the average height of the girls. Give your answer in cm.
2 m
Average Number x value Equal stage More than or less than Units table
29 P5.RA..JC.17122901
Level 2
Amin has a number of $2 and $5 notes in the ratio of 7: 4. The total value of all the notes is $306. How many $5 notes does Amin have?
2 m
Ratio to units Money Number x value Units table
30 P5.DA.JM.17083169
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?
2 m
Average Number x value

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