In a certain code language, '÷' represents '+', '-' represents 'x', '+' represents '÷' and 'x' represents '-'. Find out the answer to the following question.
Ram leaves his house at 20 mins to seven in the morning, reaches Kunal's house in 25 mins. They finish their breakfast in another 15 mins and leave for their office which takes another 35 minutes. At what time do they leave Kunal's house to reach their office?
The age of the father 4 years ago was 8 times the age of his son. At present, the father's age is 4 times that of his son. Find the present age of son.