If the number of female Physics professors in the age group 25 – 34 equals 25%
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Since,
all physics professors of 25-34 age group = 30% of 40
=30/100*40
=12
Therefore,
female physics professors in 25-34 age group
=25% of 12
=1/4*12
=3
Now,
required no. of male physics professors in 25-34 age group
=12-3
=9
all physics professors of 25-34 age group = 30% of 40
=30/100*40
=12
Therefore,
female physics professors in 25-34 age group
=25% of 12
=1/4*12
=3
Now,
required no. of male physics professors in 25-34 age group
=12-3
=9
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