BrainBashers™ is a collection of brain teasers & Japanese-type puzzles, optical illusions, and other fun stuff.
BrainBashers has items such as: Daily BB Words, logic puzzles, Sudoku, stereograms, magic games, memory games, mazes, typing tests, and so much more. Including a pointless box and a (nearly) blank page!
puzzles
illusions
fun stuff
There is a wide range of things to do every single day. Take a look at the site map to see a list of everything, or perhaps choose a random page instead.
Daily Puzzle – Aug 07
Exactly how many minutes is it before seven o'clock, if 40 minutes ago it was three times as many minutes past two o'clock?
Puzzle Copyright © Kevin Stone
workings
hint
answer
print
www.brainbashers.com
/puzzle/znnb
share
Hint
How many minutes are there between 2:00 and 7:00?
Answer
65 minutes.
Reasoning
We need to break down the five hours in the following way:
3 x Answer minutes past two o'clock
40 minutes
Answer minutes before seven o'clock
Why? It is now Answer minutes before seven o'clock, and then we have the 40 minutes before that, and the remaining time was 3 x Answer minutes past two o'clock.
So, five hours = 5 x 60 = 300 minutes. We already know about the 40 minutes, so we have to share the remaining 260 minutes in the ratio 3:1, which gives 195:65 minutes. Or using algebra 4 x Answer = 300 − 40, so Answer = 65 minutes.
Therefore, the five hours is made up of:
195 minutes past two o'clock
40 minutes
65 minutes before seven o'clock
So, it's currently 65 minutes before 7:00 = 5:55.
Double-Checking
It is now 65 minutes before seven o'clock = 5:55, so 40 minutes ago it was 5:15, which is 195 minutes after 2:00 as required (as 65 x 3 = 195).
All daily items change at midnight GMT. set time zone
New And Updated Stuff
These items were new / updated in the last 14 days. I also have a more complete list of new / updated items.
Brain TeasersUPDATED – LAST 7 DAYS
New / updated brain teasers twice a month.
Pink AfterglowNEW ILLUSION – LAST 14 DAYS
Can you see a pink afterglow?
