DAY 308:

Today’s Challenge

Follow the rules and eliminate every number from a given list, except one.

From the even numbers in the range 2-40 inclusive, eliminate:

  • multiples of 4,
  • single-digit numbers,
  • numbers which are next to (one away from) a prime number or square number.

Which is the only number that remains?

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 1st & 3rd rows of the playing board contain the following fourteen numbers:

2    9    13    14    15    22    25    36    40    42    45    66    72    80

What is the product of the two prime numbers?

Make 308 Challenge

Can you arrive at 308 by inserting 2, 4, 6, 8 and 10 into the gaps below?

(◯²×◯÷◯)–(◯×√◯= 308

Answers can be found here.

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