Sep 18, 2006
Try to quickly ESTIMATE the answers to the questions below, based on your own logical approach. The goal is not to find out (or Google) the right answer, but to, first, identify a logical approach that can help “guesstimate” an appropriate range–say + or – 30% of the actual answer– and then complete the calculations (ideally mentally, but you can also take notes) to provide a good-enough estimate.
Ready. Set. Go!
1) How many times heavier than a mouse is an elephant?.
2) How many firefighters are there in San Francisco?.
3) How many trees are there in NYC’s Central Park?.
The Answer appear below. Again, the key here is to try, plan the steps towards the solution, and do the mental calculations to find a reasonable range. That’s the brain challenge. The goal is not to find the precise correct answer.
1) Around 150,000. An average elephant weighs 4,000 kg; an average mouse 25 grams.
2) Around 350 firefighters on duty on any given day, out of a pool of 1700 firefighting overall staff.
3) There are over 26,000 trees (of approximately 175 species) in the Park.
Next brain teaser in SharpBrains’ top 25 series: