DAY 15

Today’s Challenge

Your task is to multiply two numbers together and then subtract a third number to achieve the target answer of 7. The three numbers used in each calculation must all be unique digits from 1-9.

As an example, one such way of making 7 is by doing (4×3)5. Can you find the six other ways to make 7?     [Note:  (4×3)5=7  and  (3×4)5=7  counts as just ONE way]


The 7puzzle Number 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

From the list:

  1. What is the sum of the multiples of 6?
  2. If you add 50 to me, I become a square number. Who am I?
  3. Which two numbers have a sum of 77?



. . . can be found when clicking this.


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