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3. Solve the following.

(a) Which is smaller: [tex][tex]$\frac{1}{20}+\frac{1}{5}$[/tex][/tex] or [tex][tex]$\frac{1}{5}+\frac{1}{20}$[/tex][/tex] ?


Sagot :

To address the question of which is smaller between [tex]\(\frac{1}{20} + \frac{1}{5}\)[/tex] and [tex]\(\frac{1}{5} + \frac{1}{20}\)[/tex], let's analyze both expressions step-by-step.

First, let's simplify each fraction independently:

1. [tex]\(\frac{1}{20} + \frac{1}{5}\)[/tex]:

When adding fractions, a common denominator is needed. The least common denominator for 20 and 5 is 20.

Rewrite [tex]\(\frac{1}{5}\)[/tex] with a denominator of 20:
[tex]\[ \frac{1}{5} = \frac{1 \times 4}{5 \times 4} = \frac{4}{20} \][/tex]

Now add the fractions:
[tex]\[ \frac{1}{20} + \frac{4}{20} = \frac{1 + 4}{20} = \frac{5}{20} \][/tex]

Simplify the fraction:
[tex]\[ \frac{5}{20} = \frac{1}{4} = 0.25 \][/tex]

2. [tex]\(\frac{1}{5} + \frac{1}{20}\)[/tex]:

Similarly, use the common denominator of 20. We have already converted [tex]\(\frac{1}{5}\)[/tex] to [tex]\(\frac{4}{20}\)[/tex]:
[tex]\[ \frac{1}{5} = \frac{4}{20} \][/tex]

Now add the fractions:
[tex]\[ \frac{4}{20} + \frac{1}{20} = \frac{4 + 1}{20} = \frac{5}{20} \][/tex]

Simplify the fraction:
[tex]\[ \frac{5}{20} = \frac{1}{4} = 0.25 \][/tex]

Thus, we see that:
[tex]\[ \frac{1}{20} + \frac{1}{5} = \frac{1}{5} + \frac{1}{20} = 0.25 \][/tex]

So, both [tex]\(\frac{1}{20} + \frac{1}{5}\)[/tex] and [tex]\(\frac{1}{5} + \frac{1}{20}\)[/tex] are equal to 0.25. Neither is smaller; they are exactly the same.