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7/20 + ___=19/20 is the answer 3/5

Sagot :

we must solve this equation:

[tex]\frac{7}{20}+x=\frac{19}{20}[/tex]

First, we must move 7/20 to the right hand side as -7/20. It yields,

[tex]x=\frac{19}{20}-\frac{7}{20}[/tex]

and now we can substract these fractions,

[tex]\begin{gathered} x=\frac{19-7}{20} \\ x=\frac{12}{20} \end{gathered}[/tex]

since 12=4*3 and 20=4*5, we can rewrite this result as

[tex]\begin{gathered} x=\frac{4\cdot3}{4\cdot5} \\ \end{gathered}[/tex]

and finally, the answer is x=3/5

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