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Maria is 2 years older than Sue, & the sum of their ages is 26. How old is Sue?

Pls explain the equation and the variables 

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Mark M. | Mathematics Teacher - NCLB Highly QualifiedMathematics Teacher - NCLB Highly Qualif...
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s represents Sue's age
s + 2 represents Maria's age
 
s + s + 2 = 26
 
Can you solve for s and answer?

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Moe H. | Experienced and Expert Math, Arabic, and Chess Tutor with a PhDExperienced and Expert Math, Arabic, and...
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Let Sue's age be x
then Maria's age is (x+2)
The sum of their ages (Maria + Sue=26) is (x+2) +x = 26
2x+2=26
2x=24
x=12 years (sue's age) and Maria's age is (12+2)= 14 years