Question

In a stack, there are $5$ books each of thickness $20$mm and $5$ paper sheets each of thickness $0.016$ mm, the total thickness of the stack is $1.0008\times {10}^k$ mm.
$Findk$.

Answer 1

Total thickness = thickness of books + thickness of paper sheets
= $20\times 5+0.016\times 5$
= $100+0.08$
= $100.08$
= $1.0008\times 100$
= $1.0008\times {10}^2$