Question

If the thickness of the pile of 12 cardboard is 65 mm find the thickness of a pile of 312 such cardboards

Answer 1

Thickness of 12 cardboards = 65 mm
Thickness of one cardboard = 65/12 mm
Therefore thickness of 312 cardboards = 65/12*312 = 1690 mm

Answer 2

Thickness of piles= 65mm & X

No.of cardboards = 12 & 312

Cross multiplying,

X = 65*312/12 = 1690cm or 16.90m.