Today’s Challenge
From the following list of twenty numbers:
3 4 7 10 11 15 16 17 24 27 30 32 36 48 49 54 56 64 72 80
eliminate all square numbers, multiples of 8, factors of 60 and prime numbers.
What is the sum of the TWO numbers that remain?
The 7puzzle Challenge
The playing board of the 7puzzle game is a 7-by-7 grid of 49 different numbers, ranging from 2 up to 84.
The 3rd & 7th rows contain the following fourteen numbers:
4 11 13 24 25 27 30 36 42 45 66 70 77 80
How many even numbers, when halved, become odd?
Answers can be found here.
Click this link for details of online math tuition with me, Paul Godding.