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Ni Hua is an adventurous traveler. He skydives twice in every island he visits and skydives thrice in every peninsula he visits. In the last decade, Ni Hua went skydiving a total of 454545 times in the 191919 islands and peninsulas that he visited. How many islands and peninsulas did Ni Hua visit?

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  1. 18 June, 17:15
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    Let x and y be islands and peninsulas respectively

    x+y=191919

    2x+3y=454545

    y = 191919 - x

    2x + 3 (191919 - x) = 454545

    2x + 575757 - 3x = 454545

    2x-3x = 454545 - 575757

    -x = - 121212

    x = 121212

    121212 + y = 191919

    y = 191919 - 121212

    y = 70707

    Ni Hua visited 121212 islands and 70707 peninsulas
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