Question

a+3/7×a=700
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Answer 1

[tex]a+ \frac{3}{7} a=700\\ 7a+3a=4900\\ 10a=4900\\ a=4900:10\\ a=490\\\\ Proba:490+(490*3):7=700\\ 490+210=700\\ 700=700[/tex]

Answer 2

$a+ \frac{3a}{7} =700 \\ \\ 7a+3a=4900 \\ \\ 10a=4900 \\ \\ a=4900:10 \\ \\ a=490$
Verificare
490+$\frac{490*3}{7}$=700
490+$\frac{1470}{7}$=700
490+210=700
700=700