15 terms

Proportions

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4
1/2 = x/8
9
1/3 = 3/x
15
2/5 = 6/x
2
x/14 = 1/7
6
x/15 = 2/5
4.5
1/2 = x/9
80
1/4 = 20/x
25
3/5 = 15/x
12
4/9 = x/27
32
1/8 = 4/x
90
3/10 = 27/x
2
x/8 = 5/20
6
3/9 = 2/x
100
10/x = 7/70
5
1/x = 2/10