P6 Math: Fraction of a Fraction of a Fraction

This questions splits up a total value into 2 groups.
After undergoing fractional decrease for each group, both are now of equal value.

Such questions are common on Paper 1 of P6 Prelim papers.
Calculator usage is not allowed.

There were some passengers in the airport waiting to board their planes.
2/5 of the passengers were male and the rest were female.
After 1/4 of the male passengers and some female passengers boarded their planes,
there were equal number of male and female passengers whom have yet to board their planes.

What fraction of the female passengers have already boarded their planes?


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