If the thickness of a pile of 12 cardboard

Question:

If the thickness of a pile of 12 cardboard sheets is 45 mm, then the thickness of a pile of 240 sheets is _______ cm.

Solution:

Thickness of pile of 12 cardboard sheets = 45mm

Thickness of 1 cardboard sheet = 45/12 mm

Hence, thickness of a pile of 240 sheets = (45/12)×240

= 45 × 20 = 900mm

= 900/10 cm = 90cm

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