15/18 = blank/6= 10/blank= blank/30
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Let the blank space be a
1.)
15 / 18 = a/6
=> a = 15 ×6 / 18
=> a = 90/18
=> a = 5
2.)
15/18 = 10 / a
=> a = 10 × 18 / 15
=> a = 180 / 15
=> a = 12
3.)
15/18 = a/30
=> a = 15 × 30 / 18
=> a = 450 / 18
=> a = 25
1.)
15 / 18 = a/6
=> a = 15 ×6 / 18
=> a = 90/18
=> a = 5
2.)
15/18 = 10 / a
=> a = 10 × 18 / 15
=> a = 180 / 15
=> a = 12
3.)
15/18 = a/30
=> a = 15 × 30 / 18
=> a = 450 / 18
=> a = 25
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