- 10 cm
- 12 cm
- 15 cm
- 18 cm

Option 2 : 12 cm

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**Given:**

Radius of cone = 12 cm

Height of cone = 9 cm

Radius of cylinder = 6 cm

**Formula:**

Volume of cone = [1/3]πr^{2}h

Volume of cylinder = πr^{2}h

**Calculation:**

Let level of water in cylinder increased by x cm, then

According to the question

[1/3] × π × 12 × 12 × 9 = π × 6 × 6 × x [As volume will remain constant]

⇒ x = (12 × 12 × 3)/(6 × 6)

⇒ x = 12 cm

∴ Level of milk increased by 12 cm.

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