There is one pond in which one lotus gets doubled everyday. In 20 days pond is half filled. so how many days it will take to get full completely?

Thx

the answer is 21??

yes. Double of half-full is full.

So it will take 21 days to get full completely.

To understand how many days it will take to fill the pond completely, we need to break down the information provided.

First, we know that the pond starts off being half-filled.

Then, each day, the lotus in the pond doubles.

We are told that after 20 days, the pond is half-filled.

So, if after 20 days the pond is half-filled, it means that on the 19th day it was half of half-filled, which is one-fourth filled.

Following this pattern, on the 18th day, it was one-eighth filled, on the 17th day it was one-sixteenth filled, and so on.

Now, we need to find the day when the pond is completely full. To do this, we need to figure out how many more times the lotus needs to double from being one-half filled to being completely filled.

If on the 19th day the pond was one-fourth filled, this means that the pond only needed to double one more time to become half-filled.

The doubling continues, and on the 20th day, the pond becomes one-half filled. Therefore, it will take one more day of doubling for the pond to become completely filled.

Thus, it will take 21 days in total for the pond to become completely full.

No, the answer is not 21 days. Let's break it down step-by-step:

1. On the first day, the pond is half-filled with one lotus.

2. On the second day, the number of lotus doubles to two.

3. On the third day, the number of lotus doubles again to four.

4. Continuing this pattern, on the fourth day, it becomes eight lotus.

5. On the fifth day, it becomes sixteen lotus.

6. However, on the twentieth day, the pond is only half-filled.

To find out how many days it will take to get completely full, we need to determine how many lotus are needed to fill the pond completely.

Starting from the twentieth day, we can work backwards:

20th day: Half-filled = 16 lotus
19th day: 16/2 = 8 lotus
18th day: 8/2 = 4 lotus
17th day: 4/2 = 2 lotus
16th day: 2/2 = 1 lotus

Therefore, it will take 16 + 4 + 2 + 1 = 23 days to completely fill the pond, not 21 days.