Brain Sharp level 138 answers are here. We have doublechecked the answers to ensure it is correct. However, sometimes the game is updated and the answers become out of date. If you find it incorrect, please let us know so we can fix it.
One candle is 50cm high and burns for 3 hours. another one is 70cm high and burns for 6 hours. how long does it take them to reach the same height? 6 hours, because then they’ll both be completely burnt out.