Magic Birthday Cards
Number Theory
Level
1
My day of birth appears in exactly the following color cards:
Red, Yellow, Green and Purple.
What is my day of birth?
The answer is 23.
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1 solution
Relevant wiki: Mind Reading with Math
The card color code values are red=1, yellow=2 ,green=4 ,blue =8, and purple=16. The Birthday appears in RED, YELLOW, GREEN & PURPLE cards. Sum of the values of the cards = 1 + 2 + 4 + 16 = 23.
For more details, read this wiki