# There are 4 numbers A, B, C, and D. the sum of the numbers A, B, and C is 47, the sum of B, C and D is 53, the sum of C, D and A is 55 and the sum of D, A and B is 49. Find the fiur numbers.

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If A+B+C= 47 and A=15 then B&C=32.

If B+C+D= 53 and B&C=32 then D=21

If C+D+A= 55 and D&A=36 then C=19

If D+A+B= 49 and D&A=36 then B=13

Therefore, the four unknown numbers are:

A=15

B=13

C=19

D=21