Squigly Squigly's Brain Teasers

Question:

If 7 is transformed into 13 and 11 is changed to 21 then what does 16 become?

Answer:

31, because I multiplied the number by 2 and subtracted one.

Try another Brain Teaser:

Lilly has 15 pop can tabs and all together they equal $30. She dropped one and lost 2. She has $26 worth of pop can tabs. Explain.

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