Answer:
160,170 and 240,250
Step-by-step explanation:
sorry if wrong
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.
Mixing the two concentrations would give a new concentration which is in between 50 - 60% .
D. 63% cannot be obtained
(x +4) * (x -1)
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