Brain Teasers
Prime Operations
Solve the following with the conditions given :-
D A
- B C
------
B D
a) All the numbers used A, B, C and D are prime.
b) The answer BD is also a prime number.
c) The numbers DA and BC are not prime.
d) Also the number A < C.
Find the numbers A, B, C and D.
D A
- B C
------
B D
a) All the numbers used A, B, C and D are prime.
b) The answer BD is also a prime number.
c) The numbers DA and BC are not prime.
d) Also the number A < C.
Find the numbers A, B, C and D.
Answer
The computation above is nothing but72
- 35
-----
37
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Comments
You could, if you wished, simplify your conditions down to just (a): A, B, C, and D are distinct prime digits.
In particular, your condition (d) follows
immediately from the fact that D and B are both
primes (if (d) is false, then D=2*B).
In particular, your condition (d) follows
immediately from the fact that D and B are both
primes (if (d) is false, then D=2*B).
good one
I didn't even see the second two clues (were scrolled off the bottom of the visible page on my iPhone) and thought nothing of it.
Way too many clues given for such a simple problem.
Way too many clues given for such a simple problem.
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