21. What is the next number in the series: 5, 10, 15, 30, 45, ?
A) 60
B) 50
C) 55
D) 65
[show_answer]The correct answer is: A [/show_answer]
22. What comes next in the series: 3, 4, 6, 9, 13, ?
A) 16
B) 17
C) 18
D) 19
[show_answer]The correct answer is: B [/show_answer]
23. What is the next number in the series: 1, 2, 4, 8, 16, ?
A) 32
B) 64
C) 48
D) 50
[show_answer]The correct answer is: A [/show_answer]
24. What comes next in the series: 5, 7, 9, 11, 13, ?
A) 14
B) 15
C) 16
D) 17
[show_answer]The correct answer is: B [/show_answer]
25. What is the next number in the series: 1, 2, 4, 8, 16, ?
A) 32
B) 24
C) 64
D) 48
[show_answer]The correct answer is: A [/show_answer]
