Question

Doua numere sunt direct proportionate cu 5 si cu 2.Aflati cele doua numere ,stiind ca suma lor este 147.

Answer 1

x/5 = y/2 = k

x = 5k, y= 2k

x+y = 147
5k + 2k = 147
⇒ 7 k = 147 ⇒ k= 21
x= 5 · 21 , x =105
y= 2 · 21, y= 42

Answer 2

 $\frac{a}{5}=\frac{b}{2}=\frac{a+b}{5+2}=\frac{147}{7}=21\;;\\ \Rightarrow\;\;a=5 * 21 =105\; \;si\;\;b=2 * 21 =42\;;$