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Average = (10×8+20×10+x × 20 + 40×15+50×7)/(8+10+20+15+7).
(1230+20x )/ 60 = 30.5
20 x = 1830-1230
x = 30.
(1230+20x )/ 60 = 30.5
20 x = 1830-1230
x = 30.
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