sentence1: Vikas ' s rank among the boys in that class is less than 8 th from the top and 18 th from the bottom and Tanvi ' s rank among the girls is 8 th from top and 21 st from bottom
sentence2: Vikas ' s rank among the boys in that class is 4 th from the top and 18 th from the bottom and Tanvi ' s rank among the girls is 8 th from top and 21 st from bottom