Question

sequence of 15,18,24,33

Answer 1

45 is the answer........

Answer 2

a pattern can be seen
recall the table of 3

${15}^{ \: \: + \: \: 3} {18}^{ \: \: + 6 \: \: } {24}^{ \: \: + 9 \: } {33}^{ \: \: + 12}$
therefore,

33 + 12 = 45