Answered

Sumali sa IDNStudy.com at makuha ang mabilis at kaugnay na mga sagot. Sumali sa aming platform upang makatanggap ng mabilis at eksaktong tugon mula sa mga propesyonal sa iba't ibang larangan.

there are 4 numbers A, B, C and D. The sum of the number A, B, C is 47, the sum of B, C, D is 53, the sum of C, D and A is 55 and the sum of D, A, and B, is 49. Finf the 4 numbers

Sagot :

Taskmastersidn
Given:
A+B+C = 47
B+C+D = 53
A+C+D = 55
A+B+D = 49

Notice that in the given equations, each of the variables is mentioned three times. So if get the total of all given equations we may get thrice the value of a set of variables
 (A+B+C+D). (A+B+C+D)+ (A+B+C+D) + (A+B+C+D) = 204
3(A+B+C+D) = 204
A+B+C+D = 68

The sum of all variables is 68. If we subtract the given equation, which has one missing variable, from the value of the set computed, we may get the value of the missing variable.
(A+B+C+D) -     (A+B+C)           = D
            68 -       47                     = D      
                        21                     = D
 (A+B+C+D) -     (B+C+D)           = A    
           68 -       53                     = A                                 
                        15                     = A
 (A+B+C+D) -     (A+D+C)           = B            
            68 -       55                     = B                    
                         13                     = B
 (A+B+C+D) -     (D+A+B)           = C  
            68 -       49                     = C
                         19                     = C