Simplify the following and find the value of ?
13 of ? + 47 of 114 of 539 = 31% of 2000
13 x ? + 47 x 114 x 539 = 31100 x 2000? = 378 x 3? = 1134
If a - b = 5 and a2 + b2 = 97, ab = ?
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