I mix together 4 mL of solution M, which has 50% water, and 2 mL of solution N that has 40% water. What is the water percentage in the combine solution?
a)39
b)43
c)47
d)52

• 50% of water 4ml = 2
  40% of water in 2ml = 0.8
  overall solution weight = 6ml
  ( (2+0.8) / 6 ) * 100 = 46.6 ~ 47
  option c
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