4 वर्ष पहले, वरिष्ठ शेफ की आयु उतनी ही थी जितनी कि 6 वर्ष में ट्रेनी (apprentice) की होगी। यदि, 3 वर्ष बाद, वरिष्ठ शेफ और ट्रेनी की आयु का अनुपात 5:4 हो जाता है, तो अब से 7 वर्ष बाद उनकी आयु का अनुपात क्या होगा?

At the time of marriage, a man was 6 years older than his wife. 12 years after the marriage, his age became 65 times the age of his wife. What were their ages (in years) at the time of marriage?

The total age of father and son at present is 40 years. After 16 years, the age of the father will be twice the age of his son. What is the present age of the son?