Question

$\frac{x}{21} \ \ = \frac{10}{y} = \frac{5}{7} \\ \\ \\ x + y =$
​

Answer 1

x/21 = 10/y = 5/7

x/21 = 5/7 => 7x = 5×21 => x = 5×21/7 => x = 15

10/y = 5/7 => 5y = 7×10 => y = 7×10/5 => y = 14

x + y = 15 + 14 = 29

Answer 2

Răspuns:

29

Explicație pas cu pas:

x pe 21 =5/7 rezultă x=21*5/7=x=15

10 /y=5/7=y =70 /5=14

x+y =15+14 =29