Question
P5.ST.JC.18121202-A1
The average cost of some books is $60.
When another 7 books are added,
the total cost increases by $220.
The average cost becomes $50.
How many books are there in the end?
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Primary 5 STRATEGIES P5.ST.JC.18121202

06 May 2024, 12:11 PM

The average cost of some books is $60.
When another 7 books are added,
the total cost increases by $220.
The average cost becomes $50.
How many books are there in the end?
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