Solution

24115

Problem / game
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First name
Louisa
Country
New Zealand
Age
0

To quickly calculate the number in the bottom left hand corner when you know the top number you
divide top number by 4
Find two consecutive numbers that equal this
Subtract 1 from the smaller of the two numbers and this is the number in the bottom left corner.

x = top number b = bottom left number

x divided by 4 = y
y = z + z + 1

z-1 = b