Question

A+B+A+C+A=31

X+B+X+Y+X=27

B+C+A+X+B=23

B+B+B+B+B=15

C+X+B+x+C=21

B+B+A+B+B=20

C+Y+B+X+A=????

Answer 1

B = 3 vì B+B+B+B+B = 15 = Bx5 = 15 = 3

Thay B = 3 vào B+B+A+B+B ta có:

3+3+A+3+3 = 20

12 + A =20

A = 8

Thay A=8;B=3 vào A+B+A+C+A ta có:

8+3+8+C+8 = 31

C+27=31

C = 4

Thay c=4 ;b=3 vào C+X+B+X+C ta có:

4 + x+3+X+4 = 21

11 + X x 2 = 21

X x 2   = 10

x =5

Thay x = 5 ; b=3 vào X + B+X+Y+X ta có:

5+3+5+Y+5 = 27

18 + Y=27

Y=9

Vậy C +Y+B+X+A = 4+9+3+5+8=29

 

Answer 2

B+B+B+B+B=15 => b = 3 .

B+B+A+B+B=20 => 20 - 3 x 4 = A = 20 - 12 = A => A = 8 . 

A+B+A+C+A=31 => 8 + 3 + 8 + C + 8 = 31 => 8 x 3 + 3 + C = 31 => 24 + 3 + C = 31 => 27 + C = 31 => c = 4 .

C+X+B+x+C=21 => 4 x 2 + 3 + x.2 = 21 => 8 + 3 + x.2 = 21 = 11 + x.2 = 21 => x . 2 = 10 => x = 5 .

X+B+X+Y+X=27 = 5 + 3 + 5 + Y + 5 = 27 => 18 + Y = 27 => Y = 9 . 

vậy C + Y + B + X + A = 4 + 9 + 3 + 5 + 8 = 29