A very simple utility to calculate the unknown quantity in proportions.
Select where to put the x, insert values on wich you want to calculate proportions then touch the "Calculate" button.
This app is not intended to doing complex calculations (e.g. multiple unknown quantities) or to solve the proportions in place of the students showing them all the steps.
Thanks to people who contacted us for reporting problems.
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small fixes and optimizations
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With Family Sharing set up, up to six family members can use this app.