Question

se da a+b+c+d efectuand suma oricaror trei numere dintre cele patru se obtine 26,19,21,24 cum procedez ?

Answer 1

a + b + c= 26
b+ c + d = 19
a + b + d = 21
a +c + d= 24
 
3a + 3b +3c + 3 d = 26 +19 + 21 + 24
3 ( a + b + c + d) =50 + 40
a+b+c+d = 90 : 3
 a+b+c+d= 30
26 + d= 30
d= 4
a +19 = 30
a= 11
24 + b= 30
b= 6
11 + 6 + c= 26
c= 9