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22-10-2017
Mathematics

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There are 1800 gym members in total. 3\4 are aged 25-59 years. 1/5 are over 60 years old and the remainder are under 25 years old. How many members are under 25 years old

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22-10-2017

3/4 of 1800 is [tex]\displaystyle{ \frac{3}{4}\cdot1,800 = 3\cdot450=1,350[/tex].

1/5 of 1800 is [tex]\displaystyle{ \frac{1}{5}\cdot1,800 = \frac{1,800}{5}=360[/tex]

Thus, out of 1,800 members, 1,350 are aged 25-59, 360 are aged over 60.

The remaining, 1,800-1,350-360 = 90, are members under 25 years old.

Answer: 90

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