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When a student, weighing 38 kgs, left a class, the average weight of the remaining 69 students increased by 200 g. What is the average weight of the remaining 69 students?1). 48 kg2). 52 kg3). 59 kg4). 57 kg |
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Answer» Let the average weight of the 69 students be A. ∴ total weight of the 69 of them will be 69A. As question STATES, the total weight of the class = 69A + 38 When this STUDENT is also included, the average weight decreases by 0.2 KG; ⇒ (69A + 38)/70 = A - 0.2 ⇒ 69A + 38 = 70A - 14 ⇒ 70A - 69A = 38 + 14 ⇒ A = 52 ∴ Average weight of the remaining 69 students = 52 kg |
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