$1 / 3 : 2 / 3 :: ? : 60$
$20$
$120$
$30$
$10$

10

20

120

30

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Solution

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30 is half of 60, and 1/3 is half of 2/3.

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1/3:2/3::?:60201203010

30 is half of 60, and 1/3 is half of 2/3.

$1 / 3 : 2 / 3 :: ? : 60$
$20$
$120$
$30$
$10$