Question

If the thickness of a pile of 12 cardboard sheets is 45mm ,then how many sheets of the same cardboard would be 90cm thick?

Answer 1

Let X be no. of sheets with thickness of 90 mm

Thickness of 12 cardboard sheets=45mm

Thickness of 1 cardb. sheet=45/12mm

Thickness of X cardb. sheets=45/12×X

ATQ

45/12×X=90
X = 90÷45/12
X.= 90 × 12/45
X = 2× 12
X.= 24
Therefore 24 sheets have thickness of 90mm