# math

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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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