Some people were asked to choose a drink.  One quarter chose tea.  Seven people chose coffee.  $$30 \%$$ of them chose cola.  The rest chose water.  Maya drew a pie chart to show all their choices.  The~\textquotesingle Water\textquotesingle{} section has $36^{}\circ$ on her pie chart.  How many people took the survey? 
Overseas Competition->Knowledge Point->Word Problem Modules->Solving Problems Involving Fractions and Percentages->Knowing the Base