Each of Koby’s boxes contain 3 sparklers + 5 whistlers = <<3+5=8>>8 fireworks.
So in total, Koby has 2 boxes * 8 fireworks per box = <<2*8=16>>16 fireworks.
Cherie’s box of fireworks has 8 sparklers + 9 whistlers = <<8+9=17>>17 fireworks.
Koby and Cherie therefore have a combined total of 16 fireworks from Koby + 17 fireworks from Cherie = <<16+17=33>>33 fireworks.
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