Today is Newton birthday. A year ago, Newton had five candles and he lit all the candles except the one at the last. Now he is going to light all the candles.
How old is Newton Today?
Of course, he is not five today.
Newton is 31 years old
Explanation: Newton lighting the candles in binary. 11110 =30 11111 =31
he is FOUR years old
Three candles which can burn, 60 minutes, 80 minutes and 100 minutes respectively are lit at different times. All the candles are burning simultaneously for 30 minutes, and there is a total of 40 minutes in which exactly one is burning. For how many minutes are exactly two candles burning?
If a five-hour candle and a six-hour candle were lit at the same time, how much time would elapse before one candle would be five times longer than the other?
The sum of the present ages of a father and his son is 60 years. Six year ago, father's age was five times the age of the son. After 6 years, what will be son's age?
