101 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
102 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
103 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
104 P5.FR.JM.17083064
Level 2
John spent $90 on a webcam. This was 56 of his savings. How much savings had he left?
2 m
Fraction of a whole Money Units method
105 P5.VO.JM.17083128
Level 2
The height of a rectangular tank is 21 cm. When 8400 cm3 of water is in the tank, it is 23 full. What is the base area of the tank?
2 m
Volume of cuboid Base area x height Fraction to units Units method

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