The number of planks of dimensions (4 m × 5 m × 2 m) that can be stored in a pit which is 40 m long,
Question:

The number of planks of dimensions (4 m × 5 m × 2 m) that can be stored in a pit which is 40 m long, 12 m wide and 16 m deep, is
(a) 190
(b) 192
(c) 184
(d) 180

Solution:

(b)  192

Number of planks $=\frac{\text { volume of the pit }}{\text { volume of } 1 \text { plank }}$

$=\frac{40 \times 12 \times 16}{4 \times 5 \times 2}$

$=\frac{7680}{40}$

$=192$
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