Goodbye, Barbie
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Nina has a collection of Barbie dolls. She gives half of those dolls to her cousin, and sells 20% of what's left.
She now has 12 dolls.
How many dolls did she originally have?
Photo taken from Wikipedia
The answer is 30.
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1 solution
One way of doing this is work backwards. If she sold 20% of them, whats left is 12. Therefore, x- 0.2x=12. x= 15. Since 15 is what she has left after giving half away, this means she started off with 30.