ANSWERS: 1
  • Sally's age = x Joe's age = y Right now, x + 5 = y in 15 years, 3x = y + 15 substitute x + 5 in for y in the second equation and you get: 3x = (x + 5) + 15 3x = x + 20 2x = 20 x = 10 This means that Sally is 10 right now, and Joe is 15. In 15 years, Joe will be 30, which is 3 times Sally's current age of 10.

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