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## Sagot :

1.

**Understand the volumes involved**:

- You start with a concentrated solution with a volume of 60 mL.

- You need to achieve a final volume of 150 mL after adding water.

2.

**Identify the missing value**:

- To find out how much water to add, you need to calculate the difference between the final volume and the initial concentrated volume.

3.

**Set up the equation**:

[tex]\[ \text{Final Volume} = \text{Concentrated Volume} + \text{Volume of Water to Add} \][/tex]

- Here, the final volume is 150 mL and the initial concentrated volume is 60 mL.

4.

**Solve for the Volume of Water to Add**:

[tex]\[ 150 \text{ mL} = 60 \text{ mL} + \text{Volume of Water to Add} \][/tex]

Subtract 60 mL from both sides of the equation to isolate the Volume of Water to Add:

[tex]\[ \text{Volume of Water to Add} = 150 \text{ mL} - 60 \text{ mL} \][/tex]

Simplifying this gives:

[tex]\[ \text{Volume of Water to Add} = 90 \text{ mL} \][/tex]

5.

**Conclusion**:

- You need to add 90 mL of water to the 60 mL of concentrated solution to reach a total volume of 150 mL.

Hence, the amount of water you should add is 90 mL.