Respuesta :

Answer:

1/2

Step-by-step explanation:

1/5 equals 2/10, so:

? - 3/10 = 2/10

To go backwards, we must add 3/10 to 2/10 and it is equal to 5/10, or 1/2.

So, 1/2 or 5/10 - 3/10 = 2/10

Answer:

x = 1/2.

Step-by-step explanation:

x - 3/10 = 1/5

Multiply through by 10:

10x - 3 = 2

10x = 5

x = 1/2.