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Rosann · Answer 1 · 2020-09-27T02:11:59+0000

Your privious task:

Before I start writing my answer I would like to mention that I don't speak English very well, so I am sorry if I make any mistakes (speaking, not maths xD)

So lets begin. I'd solve this task by making a system. Lets say he was in Portugal for x months and in Brazil for y months. Then x+y=14 and 130x+150y=1920:

$\left \{ {{x+y=14} \atop {130x+150y=1920}} \right. \\\left \{ {{y=14-x} \atop {13x+15(14-x)=192}} \right. \\\text{Lets solve the 2nd line:}\\ 13x+15(14-x)=192\\2x=18\\x=9\\\text{Then y=5}$

So he lived in Portugal for 9 months and in Brazil for 5 months.

Solution for this task: x=-22/83 and y=-81/83 (c is right)

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