DAY 225:

Today’s Challenge

Each of the five numbers below is the product of two prime numbers:

15       35       77       143       323

Which is the odd one out, and why?

The 7puzzle Challenge

The playing board of the 7puzzle game is a 7-by-7 grid containing 49 different numbers, ranging from up to 84.

The 5th & 6th rows of the playing board contain the following fourteen numbers:

5    6    7    12    16    18    20    21    33    49    50    56    81    84

What is the sum of the multiples of 7?

Make 225 Challenge

Can you arrive at 225 in two different ways when inserting 3, 4, 5 and 9 into the gaps below?

(◯–◯)×◯×◯² = 225

Answers can be found here.

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