Question

[tex]
\frac{a}{0,4}= \frac{b}{0,5}= \frac{c}{0,6} [/tex] şi 4a+5b+6c=77, atunci a+b+c=?

Answer 1

1] $\frac{a}{0,4} = \frac{c}{0,6} \ \textless \ =\ \textgreater \ c = 1,5a$
2] $\frac{a}{0,4} = \frac{b}{0,5} \ \textless \ =\ \textgreater \ b= 1.25a$
3] 4a + 6,25a + 9a = 77 <=> a = $\frac{77}{19,25}$
4] b= 1,25*4 = 5
5] c = 1,5*4 =6
6]4+6+5=15