Question 1135171
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<pre>
Let x be the number of candy bars;

then the number of water cans/(cups)/(containers) is 5x


The "money" equation is


    35x + 20*(5x) = 1620    cents


Simplify and solve 


    35x + 100x = 1620

    135x = 1620  ============>  x = {{{1620/135}}} = 12.


<U>ANSWER</U>.  12 candy bars and 12*5 = 60 water cans/(cups)/(containers).


<U>CHECK</U>.   12*35 + 60*20 = 1620  cents = $16.20.   ! Correct !
</pre>

Solved.


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If it is true that the solution must be as simple as possible (as it is usually expected and is commonly accepted), then
this problem is to be solved using one equation for one single unknown.