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Matt is now 3 years younger than his brother Pete. Four years ago, Matt's age was half of Pete's age. How old is each one now?

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Cheahjimmyviz
let x = Matt's age now
  x + 3 =  Pete's age
thus
 x-4 =( x + 3)/2              4years ago Matt was half of Pete age
2x-8 = x+3    / .2
x = 11years which is Matt age
Pete age =  11 + 3  = 14 years