Question

Daca 3 supra 4 din 2640 se aduna cu 2 supra 7 din 714, iar suma obtinuta se imparte la x se obtine 4. Afla numarul x.

Answer 1

[3·2640/4+2·714/7]/x=4
⇒[3·660+2·102]/x=4
⇒[1980+204]/x=4
⇒2184/x=4
⇒x=546;

Answer 2

$\frac{3}{4} 2640=2640:4*3=1980$
$\frac{2}{7} 714=714:7*2=204$
$(1980+204):x=4=\ \textgreater \ 2184:x=4=\ \textgreater \ x=2184:2=\ \textgreater \ x=546$