Questions

From Worst to Best

1 P5.ST.JC.18121200

Level 2
The average cost of 4 books is $30.
The average cost of 3 books is $10.
What is the cost of 4th book?

2 m

Attempt

2 P5.ST.JC.18121201

Level 2
The average cost of three books is $30.
Two of the books cost $10 and $20.
What is the cost of the 3rd book?

2 m

Attempt

Averaging out Average with unknown quantity Units equations

3 P5.ST.JC.18121202

Level 3
The average cost of some books is $75.
When another 3 books are added,
the total cost increases by $190.
The average cost becomes $70.
How many books are there in the end?

3 m

Attempt

2 averages Averaging out Average with unknown quantity Number x value Units equations Units table

4 P5.ST.JC.18121203

Level 3
The average cost of some books is $30.
When a book that costs $90 is added,
the average cost of the books becomes $40.
How many books are there in the end?

3 m

Attempt

2 averages Averaging out Average with unknown quantity Number x value Units equations Units table

5 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

Attempt

2 averages Averaging out Average with unknown quantity Number x value Units equations Units table

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