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 P6.ST.JC.18121453
Level 3
Fill in the blanks in numbers, units or unit equations.
Adam and Bryan have some stickers.
When Adam gives 15 to Bryan,
the number of stickers he has left is 3 times as many as that of Bryan's.
Let the number of stickers that Bryan has in the end be 1 u.

  1. Number of stickers that Adam has in the end = _____
  2. Number of stickers that Adam has at first = _____
  3. Number of stickers that Bryan has at first = _____
  4. If Adam has 40 stickers more than Bryan at first, find 1 u.
4 m
Times as many Unchanged total Units table Units equations
27 P3.ST.JC.18120903
Level 3
Adam has 50 stickers more than Bryan.
After Adam gives away 10 stickers,
he has 3 times as many stickers as Bryan.
  1. How many stickers does Bryan have?
  2. How many stickers does Adam have in the end?
  3. How many stickers do they have altogether at first?
  4. How many stickers do they have altogether in the end?
4 m
More than or less than Times as many Unchanged quantity Model Comparison Units equations Units table
28 P3.ST.JC.18120904
Level 3
Adam has 50 more stickers than Bryan.
After Bryan gives away 10 stickers,
Adam has 3 times as many stickers as Bryan.
  1. How many stickers does Bryan have at first?
  2. How many stickers does Adam have?
  3. How many stickers do they have altogether at first?
  4. How many stickers do they have altogether in the end?
4 m
More than or less than Times as many Unchanged quantity Model Comparison Units equations Units table
29 P3.ST.JC.18120905
Level 3
Adam has 10 stickers more than Bryan.
After Adam gives away 50 stickers,
Bryan has 3 times as many stickers as Adam.
  1. How many stickers does Bryan have?
  2. How many stickers does Adam have at first?
  3. How many stickers do they have altogether at first?
  4. How many stickers do they have altogether in the end?
4 m
More than or less than Times as many Unchanged quantity Model Comparison Units equations Units table
30 P5.RA.NK.22122914
Level 2
Liam and Tim share a bunch of chikoos in the ratio 5 : 3. If Liam gives Tim 23 chikoos from his share, they will have the same number of chikoos. How many chikoos does Liam have at first?
2 m
Ratio to units Equal stage after Internal transfer Units equations Units table

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