Question

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

Answer 1

Thickness of 5 paper sheets = 0.016*5= 0.08mm
Now thickness of 5 books = 5*20= 100mm
Total thickness of the stack = 100+0.08=100.08mm

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Answer 2

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

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

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

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

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

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

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

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