1.

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

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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