Question

Suma a doua numere este 630. Unul din numere este 3/4 din celalalt. Aflati numerele.

Answer 1

x + y = 630 ;
x =( 3 / 4 ) * y => x / y = 3 / 4 => x = 3k si y = 4k;
Atunci 3k + 4k = 630 => 7k = 630 => k = 630 / 7 => k = 90 ;
x = 270 si y = 360 ;
Bafta !

Answer 2

[tex]\bold{a+b=630} \\ \bold{a= \frac{3b}{4}} \\ \bold{Inlocuim:} \\ \bold{\frac{3b}{4}+^{4)}b=^{4)}630} \\ \bold{\frac{3b}{4}+ \frac{4b}{4}= \frac{2520}{4}}|*4 \\ \bold{7b=2520} \\ \boxed{\bold{b=360}} \\ \bold{a=630-360} \\ \boxed{\bold{a=270}}[/tex]