 
 <translate> In the third grade, there are 19 students. In the fourth grade, there are 2 × 19 = 38 students. Counting the boys and girls in the second grade, there are 10 + 19 = 29. There are 19 + 38 + 29 = 86 students in total. Final answer: 86. <hau> A aji na uku, akwai dalibai 19. A aji na huɗu, akwai ɗalibai 2 × 19 = 38. Idan ka ƙidaya yara maza da mata a aji na biyu, akwai 10 + 19 = 29. Akwai dalibai 19 + 38 + 29 = 86 a duka. Amsar ƙarshe: 86. 