In your purse (or pocket), you have SIX each of 7puzzleland’s brand-new 4p and 7p coins. You must try and make various amounts from 20p and above with these coins.
As shown here, the first few have been done for you:
- 20p can be made from 5 × 4p coins,
- 21p from 3 × 7p coins,
- 22p from 2 × 7p coins and 2 × 4p coins . . .
From 20p upwards, what is the lowest amount it is impossible to make from your twelve coins?
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 2nd & 4th rows of the playing board contain the following fourteen numbers:
3 8 10 17 28 32 35 44 48 54 55 60 63 64
What is the difference between the highest multiple of 11 and lowest multiple of 7?
. . . can be found when clicking this.