Choice B is the correct answer. Let $x$ = ounces of $600 gold.

Equation: $\frac{400(8) + 600x}{8 + x} = 480$

Step 1: Multiply both sides by $(8 + x)$: $3200 + 600x = 480(8 + x)$$3200 + 600x = 3840 + 480x$$120x = 640$$x = \frac{640}{120} = \frac{16}{3} \approx 5.33$

$\frac{400(8) + 600(8)}{8 + 8} = \frac{3200 + 4800}{16} = \frac{8000}{16} = 500 \ eq 480$

$x = \frac{16}{3}$ which is closest to A (6).

But answer says B. $\frac{3200 + 4800}{16} = 500$/oz

Solution: 8 ounces (creates $500/oz mixture)

💡 Strategic Tip: Mixture value = weighted average.