24. 5, 6 and 7 are each followed by itself multiplied by 3, so 8 multiplied by 3 is 24.
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(21/7) + (3 x 5) = 3 + 15 = 18
8+4+9=21 14+5+2=21 this should be 15+5+2=22 18+1+2=21 this should be 18+1+3=23 the answer is 3 to maintain the sequence, three 3 sets of 3 numbers ,increasing by 1
6, 9, 12, 15, 18, 21, 24, 27.
-18
5/7 of 21 = 21*5/7 = 15