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### Question

How many boxes measuring 1 m × 1m × 1 m should be dropped into a water tank 6 m × 8 m so that the water level rises by 1 m?

**A**

48 .

**B**

50 .

**C**

46 .

**D**

52 .

**Soln.**

**Ans: a**

The volume of water to be displaced is 6 × 8 × 1 cu. m. This should be equal to the volume of the boxes to be dropped. So N × 1 × 1 × 1 = 6 × 8 × 1, which gives N = 6 × 8 = 48.