You divide 40 by 24 since those sides are similar, and you should get about 1.666. You multiply that by 18 to get the missing side length, which is 30.
First, make 6 into an improper fraction. 6/1 Now multiply the numerators. 6x3=18 Now, the same with the denominators. 1x5=5 18/5 Now make it into a mixed number. 5x3=15 3 and... 18-15=3 3 and 3/5!! Hope this helped!
