5 : 7 = 10:__ = 15:__ = 20:__ = 25:__ = 30__

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1 Answer

All the ratios to be filled in begin with a multiple of 5. Apply the same multiple to the second figure in the given ratio to find the second figure in the missing ratios: 10:14=15:21=20:28=25:35=30:42. So, just as we had 2, 3, 4, 5 and 6 times 5, we have the same multiples of 7.
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