Two hundred ten balloons are filled for a reception. This is 70 percent of the entire number of balloons purchased. Which equation can be used to find the total number of balloons purchased?

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If x is the total number of balloons, then by simple proportion 70/100=210/x.

Or, x/210=100/70. Either of these equations could be used.

So x=210×100/70=300 balloons.

Or, 100/70=3×100/3×70=300/210. 

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