#59 Seven segments
Set by Katie Steckles
An alarm clock has four digits. In each of these digits, up to seven segments light up in order to display numbers.
When the time changes from 04:59 to 05:00, will the room get very slightly brighter or darker?
Using a 12-hour clock, which time lights up the most segments and which time uses the fewest?
For which minute in the day is there the biggest change in brightness when it changes to the following minute?
Solution next week
#58 Fulfilling fractions
Solution
The largest result possible is 16鈪�, which can be made as (6/2) 脳 (5/1) + 4/3 or as (6/1) 脳 (5/2) + 4/3.
The fractions can be combined in multiple ways to make 7. For example, (3/9 脳 6/1) + (8/4 梅 2/5) 鈥� 0/7 = 7.
The final equation can be filled in like this: (6/1 脳 8/2) 梅 (4/9 鈥� 3/7) + 0/5 = 1512. This is the largest possible total.
Quick quiz #288
set by Corryn Wetzel
1 What element has the lowest boiling point?
2 Which bird lays the largest egg relative to its body size?
3 What is considered the largest ocean current in the world?
4 Which flavour can't cats taste: salty, sweet or sour?
5 Who won the Nobel prize in chemistry for discovering noble gases?
Quick quiz #288
Answers
1 Helium
2 The brown kiwi (Apteryx australis)
3 The Antarctic Circumpolar Current
4 Sweet
5 William Ramsay