Question
P5.ST.JC.18121207-A1
The average cost of some books is $10.
After 3 new books are added,
it adds another $75 to the total cost.
As a result, the average cost of all the books increases to $15.
How many books are there at first?
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Primary 5 STRATEGIES P5.ST.JC.18121207

01 May 2024, 06:54 PM

The average cost of some books is $10.
After 3 new books are added,
it adds another $75 to the total cost.
As a result, the average cost of all the books increases to $15.
How many books are there at first?
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