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Q3. ANSWER
From the first and third rows and the third and fourth columns we get:
a + 2b + c = 32 ----------- I
a + 2b + d = 30 ----------- II
2a + 2c = 31 ----------- III
2b + 2d = 31 ----------- IV
From equation III, we get a + c = 15.5
Substitute this in I equation gives b = 8.25
Putting the value of b in equation IV gives d = 7.25
Substituting these values of b and d in equation II gives a = 6.25
Putting the value of a in equation III gives c = 9.25
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