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Average 20 numbers is ‘x’. If the average of first 12 numbers is 72.5 while average of last 5 numbers is 86.8 and 13th, 14th and 15th numbers are (3x - 48), (x + 54) and 186 respectively. Find the 14th number.

A 132

B 147.5

C 138.5

D 142

E None of these

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