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blondinia [14]
3 years ago
8

How do i work out: 3/4-3/5

Mathematics
2 answers:
Mariana [72]3 years ago
6 0

In order to add or subtract fractions, they must have the
same denominator.  You need to change both of these
fractions to have the same denominator ... without changing
their values, of course.

The smallest common denominator for these fractions is  20 .

     3/4  is the same amount as  15/20 .

     3/5  is the same amount as  12/20 .

Now that they have the same denominator, you can do
the subtraction.

Travka [436]3 years ago
5 0
First step: Get a common denominator.

3/4:-

3*5=15
4*5=20

3/5:-

3*4=12
5*4=20

Now we can subtract easily because we have common denominators.

15/20-12/20

15-12/20

3/20

Now we have our most simple answer: 3/20


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3 years ago
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The population of a city has decreased by 38% since it was last measured. If the current population is 27,900, what what the pre
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<u>Answer: </u>

The population of a city has decreased by 38% since it was last measured. If the current population is 27,900 .Previous population of city was 45000.

<u> Solution: </u>

Given that current population of city is 27900.  

Also, population of a city has decreased by 38% since it was last measured.

Let assume that population of city when it was last measured = x

Decreased of 38% means x-38% of x . we can write this as,

=x-\frac{38}{100} \times x

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