Younger 81047

In 2005, Petr was three times as old as Karel. In 2020, Karel was half his age younger than Petr. In which year was Peter born and in which Karel?

Correct answer:

p =  1990
k =  2000

Step-by-step explanation:

(p2005)=3 (k2005) k2020=p2020(k2020)/2  3kp=4010 3k2p=2020  Row2Row1Row2 3kp=4010 p=1990  p=11990=1990 k=34010+p=34010+1990=2000  k=2000 p=1990   Verifying Solution:   p1=2005p=20051990=15 p2=2020p=20201990=30  k1=2005k=20052000=5 k2=2020k=20202000=20



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