Question

Steel rods shrink 10% when cooled from furnace temperature to room temperature. If a tie rod is 30in long at furnace temperature how long is the cooled tie rod?

Answer 1

Once again same thing....
10%=10/100
you want to find what 10% of 30 is so make that x
x/30
cross multiply
30(10)=300
100(x)=100x
300/100=3
x=3

Answer 2

Now because the tie rod is steel and is going to shrink 10% which you just found out is 3in. simply subtract:
30-3=27 inches