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Lani is 3 times older than Tin . In 15 years the sum of their age is 38 . What is their present age ? Please help me .

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L = 3 T

L + 15 + T + 15 = 38

substituting
... 3T + 15 + T + 15 = 38 = 4 T + 30

solve for T, then substitute back to find L

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