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A number :
[tex]x[/tex]
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Three times of it means :
[tex]3x[/tex]
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Divided by 5 :
[tex] \frac{3x}{5} = \frac{3}{5} x \\ [/tex]
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Equals to 20 :
[tex] \frac{3}{5} x = 20 \\ [/tex]
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Now let's see what that number is ;
To find we need to solve the above equation for x .
Let's do it...
[tex] \frac{3}{5} x = 20 \\ [/tex]
Multiply sides by 5
[tex]5 \times \frac{3}{5} x = 5 \times 20 \\ [/tex]
[tex]3x = 100[/tex]
Divided sides by 3
[tex] \frac{3}{3} x = \frac{100}{3} \\ [/tex]
[tex]x = \frac{100}{3} \\ [/tex]
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