Learning Theories

Math History

# How do you work out a ratio?

###### Wiki User

###### March 02, 2012 12:41PM

To work out the Ratio of something, you have to compare numbers or quantities in the same units. For e.g.

- 1m to 10cm, for this you first have to convert them so they become the same units, which will be
- 100cm to 10cm. Which is written as:

100:10 (100cm:10cm or 1m:10cm)

## Related Questions

###### Asked in Math and Arithmetic

### How do you explain ratio?

a ratio is a comparison between 2 or more things. To work ratio
out, it will be easier if you separate it into parts. if you was to
work out the ratio of money, you would add the ratio together.
whatever the number is you convert into money. you would then times
it by the first number of the ratio which is the answer of the
first of the first part, then you add it to the second number, and
then that is the answer to the ratio problem.
This is an example: if you had to work out £100 and the ratio
was 8:2 this is how you would do it.
first part you add the 8 and the 2 together which is 10, convert
that into money it is £10
second part you times the 8 and the £10 together which is
£80
third part you times the 2 and the £10 together which is £20
then you put it in ratio which is £80:£20

###### Asked in Brazil, Ratios (mathematical)

### What is the ratio of people who work in Brazil?

A ratio is a comparison of one number to another. The second
number has not been specified in this question. The answer depends
on what you want to compare to the number of people who work in
Brazil.
You will get different numbers if you want the ratio of people
who work in Brazil to the number of:
people who work in other countries,
people who live in Brazil but don't (or cannot) work.
people who cannot speak Portuguese but live in Brazil

###### Asked in Science, Physics

### Explain how the efficiency of an ideal machine compares with the efficiency of a real machine?

Efficiency is equal to the ratio of work input to work output;
for an ideal machine this ratio is equal to 1 or 100%. For a real
machine this ratio is always less than 1 because some of the work
input is used to overcome mechanical friction within the machine
which does not contribute to the work output of the machine.