Question

( ) + ( ) = 10
+ +
( ) - ( ) = 3
|| ||
11 4​

Answer 1

Answer:

Let us give each box a variable ;

a + b = 10 ---(1)

a + c = 11 ---(2)

c - d = 3 ---(3)

b + d= 4 ---(4)

b + d = 4

b = 4 - d ---(5)

substituting eq 5 in eq 1

a + 4 - d = 10

a - d = 6

a = 6 + d ---(6)

substituting eq 6 in eq 2

6 + d + c = 11

c + d = 5

c = 5 - d ---(7)

substituting eq 7 in eq 3

5 - d - d = 3

2 = 2d

d = 1 ---(8)

substituting eq 8 in eq 4

b + 1 = 4

b = 3 ----(9)

substituting eq 9 in eq 1

a + 3 = 10

a = 7 ---(10)

substituting eq 10 in eq 2

7 + c = 11

c = 4

a = 7 , b = 3 , c = 4 and d = 1

hope it helps