Question 1118281
0.25x + 0.50(387.5 - x) = 0.40(387.5)
0.25x + 193.75 - 0.50x = 155
-0.25x = -38.75
x = 155 liters. She needs this number of liters at 25% and 387.5 - 155 = 232.5 liters at 50%
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Check:
232.5(0.5) + 155(0.25) = 155 Correct