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# 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 the pile of 12 cardboard sheets = 45 mm

Thickness of one sheet = 45/12 mm = 3.75 mm or 3 3/4 mm

Thickness of a pile of 240 sheets = 240 × 3 3/4 = 240 × 15/4 = 900 mm or 90 cm

(We use the direct proportionality method or the unitary method to find the solution.)

**✦ Try This: **If the thickness of a pile of 24 cardboard sheets is 90 mm, then the thickness of a pile of 300 sheets is _______ cm.

Thickness of the pile of 24 cardboard sheets = 90 mm

Thickness of one sheet = 90/24 mm = 3.75 mm or 3 ¾ mm

Thickness of a pile of 300 sheets = 300 × 3 ¾ = 300 × 15/4 = 1125 mm or 112.5 cm

If the thickness of a pile of 24 cardboard sheets is 90 mm, then the thickness of a pile of

300 sheets is __112.5__ cm.

**☛ Also Check: **NCERT Solutions for Class 8 Maths Chapter 13

**NCERT Exemplar Class 8 Maths Chapter 10 Problem 36**

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

**Summary:**

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.

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