
Ambrosia A. answered 09/03/20
Pre-Algebra & C2 Certified ESL Tutor for All Levels
4/5 of population is middle class
population is 2000
There's a couple ways you can solve this actually, because 4/5 can be written several ways:
4/5 (given from the prompt)
80% (4/5 * 20/1 = 80/100 or 80%)
0.8 (4 / 5 = 0.8)
----
METHOD A
4/5 * 2000/1
8000/5
=1600
METHOD B
80% * 2000 = 1600
METHOD C
0.8 * 2000 = 1600
I typically prefer the final method using the decimal if I'm using a calculator since I don't have to simplify any fractions at the end. If I can't use a calculator and the fraction isn't easy to translate (like 27/4) then I would use the first method. The second method only works with a calculator or with easy to calculate mental math, so I don't recommend relying on it often.
It's important to learn all the tools for your tool box - especially when you have to solve problems creatively. This is a critical life skill that will help you apply what you learn to real life.