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21, 42, 63, 84

Step-by-step explanation:

Numbers that have a star and a circle on them are all multiples of 3 and 7. As there are less multiples of 7 between 1-100 we should list the multiples of 7 and then check if they are also multiples of 3.

7, 14, 21, 28, 35, 42, 49, 56, 63, 70, 77, 84, 91, 98

A quick way of calculating if a number is a multiple of 3 is to see if its digital root is either 3, 6, or 9

7 is not as 7 is not a multiple of 3

14 is not as 1+4 = 5 is not a multiple of 3

21 is, as 2+1 = 3 is a multiple of 3

28 is not, as 2+8 = 10 is not a multiple of 3

35 not, 3+5=8

42 is, 4+2=6

49 is not, 4+9=13

56 is not , 5+6=11

63 is, 6+3=9

70 is not, 7+0=7

77 is not, 7+7=14, 1+4=5

84 is, 8+4=12, 1+2=3

91 is not, 9+1=10 1+0 = 1

98 is not, 9+8=17, 1+7=8

ratio is 2 : 9

the answer is three

13.5 : 3