Balance30

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Balance30 is a puzzle for people of all ages.
There are four weights 1g,3g,9g,27g and a balance scale.
Giving a thing with x grams(any one of 1g-30g) in advance, use one or more of the weight, make the balance scale balanced.
Measure the time to solve 15 questions.
Let’s solve it!

*Master Balance30? Check out Balance100, available on the App store!
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Requires iOS 6.0 or later