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OpenStudy (anonymous):
Mike is three times as old as his little sister, Mary. In 4 years, he will be twice as old as Mary. How old is Mary?
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OpenStudy (anonymous):
Let Mike's age be "3x" yrs. Mary's age is "x" yrs. Mike's age will be "3x+4" yrs. Mary's age will be "x+4" yrs. Mike = 2(Mary) 3x+4 = 2(x+4) 3x+4 = 2x + 16 x = 4 yrs. (Mary's age NOW) 3x = 12 yrs. (Mike's age NOW) Mike is 12 years old.
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