Apparently, and though I find it stupid, the answer is 15.
The math is this 1/3*6 * Y = 3
1/2*20 *Y = ?
First we find "Y"= 1.5, then the answer is 15
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One third of 6 is 2, not 3. Half of 20 is 10.
A third of 20 is 20 divided by 3 or 6 and 2/3rds.
6
It is 6 2/3.
Half of one cup and a third = two thirds of a cup.