SIMULATION -
The number of attendees at a certain annual conference is 256 this year and has always doubled every five years. How many people attended the conference 20 years ago?
Click on the answer box, then type in a number. Backspace to erase.
SIMULATION -
The number of attendees at a certain annual conference is 256 this year and has always doubled every five years. How many people attended the conference 20 years ago?
Click on the answer box, then type in a number. Backspace to erase.
To find the number of attendees 20 years ago, given that the number of attendees doubles every five years, you can work backwards from the current number of attendees. The number this year is 256. Five years ago, the number would have been half of that, which is 128. Ten years ago, it would have been half of 128, which is 64. Fifteen years ago, it would have been half of 64, which is 32. Twenty years ago, it would have been half of 32, which is 16. Therefore, 20 years ago, there were 16 attendees at the conference.
There is a typo in the explanation below. 5 years ago: 128 10 years ago: 64 15 years ago: 62 >>>>> Should be 32 20 years ago: 16