Average weight of a class consisting 24 students is 47.25 kg. When two students leave the class new average is decreased by 0.25 kg. If weight of first students was 49 kg, find the weight of other student. (in kg)
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47
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49
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51
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53
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None of these
C
Correct answer
Explanation
Original total weight = 24 × 47.25 = 1134 kg. New total weight = 22 × 47 = 1034 kg (since new average decreases by 0.25 kg). Combined weight of two leaving students = 1134 - 1034 = 100 kg. First student weighs 49 kg, so second student weighs 100 - 49 = 51 kg. Answer is C (51).