Question

Steel rods shrink 10% when cooled from furnace temperature to room temperature. If a tie rod is 80 in long at furnace temperature, how long is the cooled tie rod?

Answer 1

Given that the initial length of the rod is 80 inches.

And it shrinks 10% when cooled from the furnace.

Let the new length be x inches.

Then the length of the shrinked rod will be

$\begin{gathered} x=[80-10\%\text{ of 80\rbrack inches} \\ x=[80-\frac{10}{100}\times80\text{ \rbrack inches} \\ x=[80-8]\text{ inches} \\ x=72\text{ inches} \end{gathered}$

Hence, the length of the shrinked rod will be 72 inches.