Verified Answer :

sgttrumbo

36/162
An easy way to do this is to multiply both the numerator and the denominator by 2. However, as long as you do the same operation to both numbers, the fraction will remain equivalent. 

Some equal or equivalent fraction for 18/81 are as follows:

2/9 = 4/18 = 6/27 = 8/36 = 10/45 = 12/54 = 14/63 = 16/72 = 18/81 = 20/90 = 22/99 = 24/108 = 26/117 = 28/126 = 30/135 = 32/144 = 34/153 = 36/162 = 38/171 = 40/180.