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Roberto and Luisa Barron Lopez each work full time jobs, and Luisa's mother, Carmena, collects a monthly pension of $628. Between the three of them, their total household income is $4238 each month. If Luisa earns $1772, how much does Roberto earn each month?

  • math -

    first, between involves two
    among involves more than teo

    l = 1772
    c = 628

    r + 1772 + 628 = 4238
    r = 1838

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