$$\frac{1}{9}$$ of Glen's money = $$\frac{1}{5}$$ of Nick's money. Glen has $36.

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• $$\frac{1}{9}$$ of Glen = $$\frac{1}{5}$$ of Nick ⇒ G : N = 9 : 5
• Glen → 9u = $36 ⇒ 1u = $36 ÷ 9 = $4
• Nick → 5u = 5 × $4 = $20

Nick has $20.
Check: $$\frac{1}{9}$$ × 36 = $4. $$\frac{1}{5}$$ × 20 = $4. Equal. ✓