Question

Which stack of book is the tallest?

• A. Stack 1
• B. Stack 2
• C. Stack 3
• D. All are of same height

Answer 1

The correct option is B Stack 2

To compare, we have to convert all of the given measurements to the same units. Since two of the units are in centimetres, let us convert the measurement given in millimetres to centimetres.
1 cm = 10 mm
height of stack 1 = 600 mm
= 600 ÷ 10 cm

height of stack 1 = 60 cm
height of stack 2 = 62 cm
height of stack 3 = 42 cm
62>60>42
therefore stack 2 is the tallest.
Option B is the answer