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25-11-2014
Mathematics

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Christina collects stamps. She has 47 stamps in all. She has 20 stamps from Europe. The number of African stamps is 2 times the number of Asian stamps. How many stamps from each of these three continents does he have?

Answer :

25-11-2014

[tex]x-Asian\ stamps\\2x-African\ stamps\\\\47-20=27\\\\x+2x=27\\3x=27\ \ \ \ |:3\\x=9\\\\2x=18\\\\He\ have\ 20\ stamps\ from\ Europe,\ 9\ from\ Asia\ and\ 18\ from\ Africa.[/tex]

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