Question

In a stack there are $6$ magazines, each of thickness $20$mm and $5$ sheets of paper each of thickness $0.016$ mm. What is the total thickness of the stack (in mm)?

• A. $1\cdot 2008$
• B. $1\cdot 2008\times {10}^2$
• C. $1\cdot 2008\times {10}^{-2}$
• D. $1\cdot 2008\times {10}^3$

Answer 1

The correct option is B $1\cdot 2008\times {10}^2$

Thickness of 1 magazine$=20$mm
$\therefore$Thickness of 6 magazine$=6X20=120$ mm
Also,
Thickness of 1 sheet of paper $=0.016$
$\therefore$ Thickness of 5 sheets of paper$=5X0.016=0.080$ mm
$\therefore$ Total thickness = 120 + 0.080=120.08$
$1\cdot 2008\times {10}^2$ mm