16-challenge

My fellow number-crunchers,Given a bundle of four random numbers, try to calculate them to 16 by using each number once at most with the basic arithmetic operators (+, -, *, and /) in a standard calculator format (order of operations, or PEMDAS, does not apply). Try to solve as much bundles as you can within a minute. Five seconds will be awarded each time you answer a bundle correctly, whereas you'll lose five if incorrect. Otherwise, skip the current bundle without being penalized if you're unsure how to solve it. Think you could handle the challenge?
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The game is compatible with all phones and tablets.
Sound credits: Mike Koenig, Cam, His Self, and KevanGC.