Question 252382
Four years from now Jackie will be twice mary's age. mary is now 3, how old is jackie?
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NOW DATA:
Let Jackie be "j" yrs. old.
Mary is 3 yrs old.

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4 yrs from now DATA:
Jackie will be "j+4" yrs. old.
Mary will be 7 yrs old.
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Equation:

j+4 = 2*7
j =  10 yrs old (Jackie's age NOW)
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Cheers,
Stan H.