Respuesta :

blackshades

Answer:

x = 2.85 = 20/7

Step-by-step explanation:

x : 5 = 12 : 21

=》x/5 = 12/21

Cross multiply,
21 *x = 5*12

21x = 60

x = 60/21

x = 2.85 = 20/7

________

Hope it helps ⚜

ujalakhan18

Answer:

[tex]\huge\boxed{\sf x = 2.86}[/tex]

Step-by-step explanation:

Given proportionality:

x : 5 = 12 : 21

We know that:

Product of means = product of extremes

Means : 5,12

Extremes : x,21

5 × 12 = x × 21

60 = 21 x

Divide both sides by 21

60/21 = x

2.86 = x

x = 2.86

[tex]\rule[225]{225}{2}[/tex]