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22 October, 15:55

Wolfrich lived in Portugal and Brazil for a total period of 141414 months in order to learn Portuguese. He learned an average of 130 new words per month when he lived in Portugal and an average of 150 new words per month when he lived in Brazil. In total, he learned 1920 new words. How long did Wolfrich live in Portugal, and how long did he live in Brazil?

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  1. 22 October, 16:39
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    The total period should be 14 months and not 141414 months.

    Thus answer will be: number of months spent in Brazil is 5 months and he spent 9 months in Portugal.

    Step-by-step explanation:

    Let the number of months he lived in Portugal be X and the number of months he lived in Brazil be Y: Thus we have:

    X + Y = 14 months.

    He learned an average of 130 new words per month when he lived in Portugal: 130 x number of months (X) = 130X

    and an average of 150 new words per month when he lived in Brazil: 150 x number of months in Brazil (Y) = 150Y.

    Thus we have 130X + 150Y = 1920

    Since X + Y = 14: make X subject of formula: X = 14 - Y. then substitute this for X in the equation below

    130X + 150Y = 1920

    130 (14-Y) + 150Y = 1920

    1820 - 130Y + 150Y = 1920

    150Y - 130Y = 1920 - 1820

    20Y = 100

    Y = 100 / 20 = 5 months

    Thus number of months spent in Brazil is 5 months. To find the number of months spent in portugal, use the first equation:

    X + Y = 14 where Y is 5

    X = 14 - 5 = 9 months. Thus he spent 9 months in Portugal
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