# SOLUTION: paul is 4 years younger than his brother. in 4 years, paul will be three-fourths as old as his brother. how old are they now?

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 Click here to see ALL problems on Systems-of-equations Question 611077: paul is 4 years younger than his brother. in 4 years, paul will be three-fourths as old as his brother. how old are they now?Answer by Maths68(1474)   (Show Source): You can put this solution on YOUR website!Let Present age of Paul = p Present age of his brother = b Paul is 4 years younger than his brother p=b-4...........(1) In 4 years, Paul will be = p+4 His brother be = b+4 Then Paul will be three-fourth as old as his brother p+4=3/4(b+4) 4(p+4)=3(b+4) 4p+16=3b+12 4p-3b=12-16 4p-3b=-4 Put the value of p from (1) to above equation 4(b-4)-3b=-4 4b-16-3b=-4 4b-3b=-4+16 b=12 Put the value of b in (1) p=b-4 p=12-4 p=8 Present age of Paul = p = 8 Present age of his brother = b = 12