Question 725523
Set up proportions:  3/5 = 6/x and 3/5 = 8.5/x<P>
Cross multiply and solve.<P>
3x=30 ---> x=10  <P>
3x = 42.5 ---> x = 14.167<P>
The dimensions of the big rectangle are width 10 inches and length appox. 14.167 inches.