Answer:
21
Step-by-step explanation:
15 + 6= 21
so 21-6= 15
there for your answer would be 21
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Add All The Numbers (Which Gives You 19.43) Then Divide By Four Because There Are Four Numbers That Were Added Together. The Average Is 4.8575.
4x+1+57=90
4x+58=90
4x=32
X=8