Step 1: Understand the allocation.
Z’s share is fixed at \(1/4\). Unless stated otherwise, the remaining \(3/4\) is shared by old partners in their old ratio \(2:1\).
Step 2: Compute each partner’s new share.
Remaining share \(= 1 - \frac{1}{4} = \frac{3}{4}\).
\[
X = \frac{3}{4}\times \frac{2}{3}=\frac{1}{2},\quad
Y = \frac{3}{4}\times \frac{1}{3}=\frac{1}{4},\quad
Z = \frac{1}{4}.
\]
Step 3: Convert to simple ratio.
\(\frac{1}{2}:\frac{1}{4}:\frac{1}{4} = 2:1:1\).
Final Answer:
\[
\boxed{X:Y:Z = 2:1:1}
\]
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