Today’s Challenge
How many 3-digit numbers contain at least two 7’s?
If you have an answer, comment below or send us a tweet at @7puzzle.
The 7puzzle Challenge
The playing board of the 7puzzle game is a 7-by-7 grid containing 49 different numbers, ranging from 2 up to 84.
The 4th & 7th columns of the playing board contain the following fourteen numbers:
3 5 6 9 20 24 28 32 42 50 63 66 72 77
Which five numbers become prime numbers when 5 is added to each of them?
Make 347 Challenge
Can you arrive at 347 by inserting 2, 4, 5, 10 and 20 into the gaps below?
◯²–[◯²+(◯+◯)×◯)] = 347
Answers can be found here.
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