(a) 18
18 / 3 = 6
6 + 5 = 11
18 - 11 = 7
18 / 2 = 9
[tex]7 \neq 9[/tex]
(b) 24
24 / 3 = 8
8 + 5 = 13
24 - 13 = 11
24 / 2 = 12
[tex]11 \neq 12[/tex]
(c) 30
30 / 3 = 10
10 + 5 = 15
30 - 15 = 15
30 / 2 = 15
[tex]15 = 15[/tex]
(d) 48
48 / 3 = 16
16 + 5 = 21
48 - 21 = 27
48 / 2 = 24
[tex]27\neq 24[/tex]
(e) 60
60 / 3 = 20
20 + 5 = 25
60 - 25 = 35
60 / 2 = 30
[tex]35 \neq 30[/tex]
Answer: (c) $30