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This problem trains for: SAT-I, GMAT, AMC-8, Math Kangaroo 5-6.
2 years ago little Heidi was 5n/2 years old. 6 years from now, Heidi will be 9n/2 years old. How old is she now?
(character from Johanna Spyri's "Heidi")
In a span of 8 years, Heidi has aged 8 years:
Solve for n:
We add 2 to Heidi's age from 2 years ago to find her current age:
Heidi is now 12 years old.