Please help ASAP please give answers to both questions:)

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?

Maria found the least common multiple of 6 and 15. her work is shown below. multiples of 6: 6, 12, 18, 24, 30, 36, 42, 48, 54, 60, . . multiples of 15: 15, 30, 45, 60, . . the least common multiple is 60. what is maria's error?

If a flying disk is 139 meters in the air and travels at an average of 13 m/s how long is it in the air