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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.
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Solution
If the thickness of a pile of 12 cardboard sheets is 45 mm, then the thickness of a pile of 240 sheets is 90 cm.
Explanation:
The thickness of a pile of 12 cardboard sheets = 45 mm
∴ The thickness of a pile of 1 cardboard sheet = `45/12 mm`
So, the thickness of a pile of 240 cardboard sheets = `45/12 xx 240 mm`
= 45 × 20
= 900 mm
= `900/10 cm` ...`[∵ 1 mm = 1/10 cm]`
= 90 cm
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