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3. Let's consider how much she earns for 1 to 12 cakes sold:
   1 sold:     1 x $3      =  $3
   2 sold:     2 x $3      =  $6
      ...
  11 sold:    11 x $3      = $33
  12 sold:    12 x $3 + $8 = $44

So if we want to consider the least number of cakes sold,
we divide $1452 into chunks of $44 (for every 12 sold).

Turns out that 1452/44 = 33 exactly. So the least number of
cakes sold is 33 x 12 = 396.

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4. We start with A:B:C = 11u:1u:3u, a total of 15 units.
At the end we must have 5u:5u:5u since they are all equal.
So 5u = 460 and u = 92.
Tank C went from 3u to 5u. So 2u was transferred from A to C.
That means 184 litres was transferred.

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