The present age of R is twice that of his son. Six years hence the ratio of their ages will be 23 : 13. What is the present age of his son? R की वर्तमान आयु उसके पुत्र की आयु का दोगुना है | 6 वर्ष बाद, उनकी आयु का अनुपात 23 : 13 हो जाएगा | उसके पुत्र की वर्तमान आयु क्या है ?

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