Answer:
X = 32
Y = 96
Explanation:
Z = 5%
Z = (0.04X + 0.08Y) / (X + Y)
we can substitute Z:
0.05 = (0.04X + 0.08Y) / (X + Y)
0.05 (X + Y) = 0.04X + 0.08Y
0.05X + 0.05Y = 0.04X + 0.08Y
0.01X = 0.03Y
X = 0.03Y / 0.01 = 3Y
This means that we must choose one value for Y that divided by 3 equals another option:
the only possibility that fits the equation is: