How can you use the timers to find out when exactly 15 minutes has passed?

When the 7-minute hourglass runs out put it aside. You will have 4 minutes left in the 11-minute hourglass. That starts your 15 minutes. Let the 4 minutes run out and then turn the 11–minute hourglass over and after it empties 15 minutes will have run by.

How can you cook an egg for exactly 15 minutes?

After it empties, turn the small glass, start boiling your eggs and continue watching the big glass. When, at the end of 11 minutes, the big one empties the small glass will be running for 4 minutes. Turn the big glass and wait another 11 minutes. 4 + 11 = 15.

How do you measure 9 minutes using only a 4 minute and 7 minute hourglass?

When the 4-min timer is empty for the second time, the 7-min timer has 1 minute worth of sand in the bottom half. Flip it over so there is now 1 minute in the top. When the 7-min timer empties, 9 minutes have elapsed.

How do you measure 15 minutes to boil an egg if there are 2 kinds of hourglass 11 minutes 7 minutes?

Start the 2 hourglasses together. When the 7 minute hourglass finishes, turn it over. When the 11 minute hourglasses finishes, turn the 7 minute hourglass over again. When the 7 minute hourglass finishes the 15 minutes will be up.

How do you measure 15 minutes?

When the 7 minute hourglass runs out, there are 4 minutes left on the 11 minute hourglass. Start your measurement period. When the remaining 4 minutes on the 11 minute hourglass are through, turn the 11 minute hourglass over. When it’s done, you’ve timed 4 + 11 = 15 minutes.

What is hourglass problem?

Problem Statement The sum of an hourglass is the sum of all the numbers within it. The sum for the hourglasses above are 7, 4, and 2, respectively.

What happens if you boil an egg for 15 minutes?

If you boil an egg for five or 10 minutes, it becomes firm and cooked. If you boil it for hours, it becomes rubbery and overcooked.

How can I measure 15 minutes?

Starts here2:29How do you measure EXACTLY 15 minutes with a 7 and 11 – YouTubeYouTube

How is 7 minutes using 2 hourglasses measured?

Starts here3:05The HourGlass PUZZLE || Two Sand Timers || Interview Puzzle – YouTubeYouTube

How do you solve an hourglass puzzle?

Starts here14:15Hourglass – the hardest puzzle by Hanayama. – YouTubeYouTube

What is the next number in the series 1 11 21?

the next term in the series is 1113213211. so the series continues as : 1, 11, 21, 1211, 111221, 312211, 13112221, 1113213211……… fourth term is 1211, read as “ one one one two two one” , so the next term in the series is 111221………and so on ….

How do you use the 7 minute and 11 minute hourglass?

The 7 minute hourglass will run out after 7 minutes, of course, leaving 4 minutes in the 11 minute hourglass. Turn over the 7 minute hourglass as soon as it runs out. After 11 minutes, the 11 minute hourglass will run out. The 7 minute hourglass will have 4 minutes worth of sand in the bottom.

How many turns does it take to empty the hourglass?

After 1 minute (22 minutes after the beginning of the experiment) the big hourglass will become empty. Now, use the small glass twice to count 14 minutes. 1 + 14 = 15. In all, it will take 4 turns for the small glass and 1 turn for the bigger one. Five turns is not too much.

How do you measure 15 minutes on a sand hourglass?

Before beginning your 15 minute measurement, turn both hourglasses. When the 7-minute one runs out, bring the 11-minute one to rest, ie turn it on its side so no sand flows in either direction. You then have 4 minutes of sand remaining in one side of the hourglass.

How many minutes are in the bottom of a 7 minute glass?

There will be nosand in the top of the seven minute glass and 4 minutes in the top of the 11 minute glass. Immediately restart the seven minute glass. When the top of the 11 minute glass is empty there will be fourr minutes in the bottom of the 7 minute glass..