12. What is the least common multiple of 25 and 100? *

25
50
100
125
13. Which of the following is a prime number? *

2
9
15
21


14. What is the greatest common factor of 16, 32, 72? *

2
4
8
16


15. Which of the following numbers gives 240 when added to its own square? *

15
16
18
20​