Question

In a stack there are 5 books each of thickness 20mm and 5 paper sheets each of thickness 0.016mm. what is the total thickness of the stack.

Answer 1

thickness of 1 book =20mm
thickness of 5 book=5×20mm=100mm

thickness of 1 paper sheet=0.016
thickness of 5paper sheet=0.016×5=0.08

total thickness of stack =100+0.08=100.08

Answer 2

$\rm{Total \: number \: of \: books \: in \: the \: stack \: = \sf \purple{5}}$

$\rm{thickness = \sf \purple{20mm}}$

$\rm{Total \: thickness \: of \: the \: books = \sf \purple{20×5=100}}$

$\rm{Total \: number \: of \: paper =\sf \purple{5}}$

$\rm{thickness \: of \: the \: paper =\sf \purple{0.016mm}}$

$\rm\footnotesize{Total \: thickness \: of \: the \: paper \: \sf \purple{=5×0.016=0.080}}$

$\rm \blue{Total \: thickness \: of \: the \: stack = }$

$\fcolorbox{purple}{pink}{=100+0.080=100.080=1.0008×10² mm}$