The question below deals with the topic of "Average".
Each of the 2 groups' average is known and the average of both groups is also given.
However the exact number of the parties in one of the groups was not provided.
Such questions appears in P6 mid year and prelims.
Calculator usage is allowed.
15 girls spent an average of $30 on stationery.
A group of boys spent an average of $22 on stationery.
Both the boys and girls spent an average of $25 on stationery.
How many children were there altogether?
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