1. Correct Answer: _Option A: z < x < y_
 2. Explanation:
     Let's break down the problem step by step:
     Step 1: Understanding the given conditions
     ● Condition 1: When 70% of a number \( x \) is added to another number \( y \), the sum becomes 165% of the value of \( y \).  
       Mathematically, this can be expressed as:
       \[
       0.7x + y = 1.65y
       \]
     ● Condition 2: When 60% of the number \( x \) is added to another number \( z \), the sum becomes 165% of the value of \( z \).  
       Mathematically, this can be expressed as:
       \[
       0.6x + z = 1.65z
       \]
     Step 2: Solving the equations
     ● From Condition 1:  
       \[
       0.7x + y = 1.65y
       \]
       Rearranging gives:
       \[
       0.7x = 1.65y - y
       \]
       \[
       0.7x = 0.65y
       \]
       \[
       x = \frac{0.65}{0.7}y
       \]
       \[
       x = \frac{65}{70}y
       \]
       \[
       x = \frac{13}{14}y
       \]
     ● From Condition 2:  
       \[
       0.6x + z = 1.65z
       \]
       Rearranging gives:
       \[
       0.6x = 1.65z - z
       \]
       \[
       0.6x = 0.65z
       \]
       \[
       x = \frac{0.65}{0.6}z
       \]
       \[
       x = \frac{65}{60}z
       \]
       \[
       x = \frac{13}{12}z
       \]
     Step 3: Comparing the values
         ○ From \( x = \frac{13}{14}y \), we know \( x < y \) because \(\frac{13}{14} < 1\).
         ○ From \( x = \frac{13}{12}z \), we know \( x > z \) because \(\frac{13}{12} > 1\).
     Combining these inequalities, we have:
     \[
     z < x < y
     \]
     Therefore, the correct answer is _Option A: z < x < y_.