Number on the Bottom

What numbers should go on the bottom line?
3 6 9 15
8 2 10 12
11 8 19 27
19 10 29 39
? ? ? ?




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12, 20, 40, 72, 116, 172 ?

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Given below is simple addition with a defined pattern pattern:
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10 + 11 = 9

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Solve the Addition

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Below, you can see some coding:
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February = 628
March = 1335
April = 145
May = 1353
June = 1064
July = 1074
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Now deciphering the way it has been coded, can you find out how September will be coded?

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Jigsaw puzzles

Jigsaw puzzles soared in popularity during the great depression, as they provided a cheap, long-lasting, recyclable form of entertainment.