The question below deals with the topic of "Average",
with the before and after average known
(old average vs new average).
This question does not provide the number of parties involved at first or at the end.
It only provides the difference between the 2 unknowns.
Such questions appears in P5 SA2 Paper 2 and P6 Paper 2.
Calculator usage is allowed.
Brenda has a collection of dresses.
The average cost of her dresses were $145.
The average cost of her dresses were $145.
After she bought 2 new dresses at $155 each,
the average costs of all her dresses became $147.
How many dresses did Brenda have in her collection at the end?
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