Question
P5.ST.JC.18121208-A1
The average cost of some books is $25.
After 6 new books are added,
it adds another $18 to the total cost.
As a result, the average cost of all the books decreases to $21.
How many books are there at first?
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Primary 5 STRATEGIES P5.ST.JC.18121208

17 May 2024, 08:00 AM

The average cost of some books is $25.
After 6 new books are added,
it adds another $18 to the total cost.
As a result, the average cost of all the books decreases to $21.
How many books are there at first?
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