A father said to his son, "n years back I was as old as you are now. My present age is four times

A father said to his son, "n years back I was as old as you are now. My present age is four times your age n years back". If the sum of the present ages of the father and the son is 130 years, what is the difference of their ages?

एक पिता ने अपने पुत्र से कहा, "n वर्ष पहले मेरी आयु तुम्हारी वर्तमान आयु के बराबर थी। मेरी वर्तमान आयु, तुम्हारी n वर्ष पहले की आयु की चार गुना है"। यदि पिता और पुत्र की वर्तमान आयु का योगफल 130 वर्ष है, तो उनकी आयु में कितना अंतर है?

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