Question
P5.ST.JC.18121208-A1
The average cost of some books is $28.
After 4 new books are added,
it adds another $10 to the total cost.
As a result, the average cost of all the books decreases to $22.
How many books are there at first?
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Primary 5 STRATEGIES P5.ST.JC.18121208

05 May 2024, 09:50 AM

The average cost of some books is $28.
After 4 new books are added,
it adds another $10 to the total cost.
As a result, the average cost of all the books decreases to $22.
How many books are there at first?
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