11 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
12 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
13 P5.DA.JM.17083178
Level 2
From January to August last year, Sherrie read an average number of 7.5 story books per month. She did not read any story books in the next 4 months. On the average, how many story books did she read per month last year?
2 m
Averaging out Time D Multiplication
14 P5.DA.JM.17083143
Level 1
The average of two numbers is 124 and the average of another set of two numbers is 262. Find the average of these four numbers.
2 m
Averaging out 2 averages Number x value Units table
15 P5.DA.NK.23052622
TRY FOR FREE
Level 2
A group of 50 girls and 20 boys took part in a Mathematics test. The average score of the girls was 50 points. While the average score of the boys was 64 points. What was the average score of all the students who participated in the test?
2 m
Attempt
Averaging out 2 averages Number x value Units table

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