Question 1128820
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U completes one balloon in 5+3 = 8 seconds.


L completes one balloon in 6+4 = 10 seconds.


So, every 120 seconds (every 2 minutes) they complete {{{120/8}}} + {{{120/10}}} = 15 + 12 = 27 balloons.


In 14 minutes they will complete  {{{(14/2)*27}}} = 7*27 balloons.


It is what is in 3 bags,


So, there are  {{{(7*27)/3}}} = 7*9 = 63 balloons in each bag.     <U>ANSWER</U>
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Solved.