How many soap cakes each measuring 7 cm 7cmx 5 cm x 2.5 cm can be placed in a box of size 56cm x 40 cm x 25 cm?
We know that,
Volume of cuboid = Length × Breadth × Height
Therefore,
Volume of a soap cake = 7 × 5 × 2.5
= 87.5 cm3
Also,
Volume of the box = 56 × 40 × 25
= 56000 cm3
Therefore,
Number of soap cakes = 
= 640 units
Hence,
640 cakes of soap can be placed in a box of the given size
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