Answer :

The sum of 8 and 7= 8+7=15
and to double it you just do 15*2 and that = 30.
Insidious
Hey there!
To figure out this question, you just have to do this step by step.

1. Find the sum of 8 and 7
8+7=15

2. Now, double the sum.
15x2=30

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