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2015-09-17T21:36:03+08:00

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_ + _ + _ = 30
If you mean that the blanks are the same numbers then,
3 _ = 30
_ = 10
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2015-09-18T15:41:37+08:00

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
There is an infinite number that can take the place of that "blank" but if you are referring to the same numbers, the formula is.

30/x

wherein x = no. of blanks 

Evaluation

30/3
10

So therefore, the answer could be 10.
Checking, 10 + 10 + 10 = 30

credits to another moderator. 
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