Is it equivalent 18 vocabulary words are learned in 2 hours the same as learing 27 words in 3 hours

Yes because if you set it up as an proportion it will be 18 over 2 = 27 over 3 if you simplify that it would be 9 over 1 on both sides

Yes, because they are all in incremts of nine which means 9 words in 1 hour and then 18 words in 2 hours and 27 words in 3 hours. In other words 18 divided by 2 is 9 and 27 divided by 3 is nine so it is equivalent.