Question

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

Answer 1

3/4 of 1800 is
`\displaystyle{ (3)/(4)\cdot1,800 = 3\cdot450=1,350`.

1/5 of 1800 is
`\displaystyle{ (1)/(5)\cdot1,800 = (1,800)/(5)=360`


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