Question

Please answer this question

Answer 1

a+b=8------eq(1)

a+c=13------eq(2)

b+d=8--------eq(3)

c-d=6-------eq(4)

now

eq(1)+eq(2)-eq(3)-eq(4)

2a=7

a=7/2

b=9/2

c=19/2

d=7/2

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