Question
If 3(p - q) = 27 and 3(p + q) =
243, then p is equal to:Solution
3p - q = 27 = 33    p - q = 3 ....(i) 3p + q = 243 = 35    p + q = 5 ....(ii) On solving (i) and (ii), we get p = 4.
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