Respuesta :

Answer:

10

Step-by-step explanation:

10+20=30

2(5+__) has to equal 30

2*5 is 10 so the missing number has to be 20 when multiplied by 2

__=10

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Answer:

10

Step-by-step explanation:

10 + 20=30

30 divided by 2 = 15

15-5= 10 so 10 is your answer