Respuesta :

Answer:

3/10

Step-by-step explanation:

2/5 + x = 7/10

x = 7/10 - 2/5

x = 7/10 - 4/10

x = 3/10

s132486

Answer: 3/10

Step-by-step explanation:

2/5 + __ = 7/10 fraction               2/5 + 3/10 = 7/10

0.4 + __ = 0.7 decimals                0.4 + 0.3 = 0.7

0.7 - 0.4 = 0.3