Question 1183841
<pre>

1/3 + 2/5 = 5/15 + 6/15 = 11/15ths of the guests drank soda or orange juice.

That left 1 - 11/15 = 15/15 - 11/15 = 4/15 who had nothing to drink.

Let x represent the number of guests: 

{{{expr(4/15)x = 16}}}

Multiply both sides by the reciprocal 15/4:

{{{expr(15/4)expr(4/15)x = expr(15/4)16}}}

{{{x=60}}}

There were 60 guests.

Edwin</pre>