The ages 2

The ages of the two persons differ by 18 years. Twelve years ago, the elder one was 4 times as old as, the younger one. The present age of the elder one is:

Correct answer:

a =  36

Step-by-step explanation:

a=b+18 a12=4 (b12)  ab=18 a4b=36  Row2Row1Row2 ab=18 3b=54  b=354=18 a=18+b=18+18=36  a=36 b=18

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