The average weight of a class of 24 students is 35 kg. If the weight of the teacher be included, the average rises by 400g. The weight of the teacher is

50 kg

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55 kg

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45 kg

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53 kg

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Solution

The correct option is C 45 kg
Total weight of 24 students $= 24 \times 35 = 840 k g$
Total weight of 25 persons with teacher $= 25 \times 35.4 = 885 k g$ .
$∴$ Weight of teacher $= (885 - 840) k g = 45 k g$ .

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The average weight of a class of 24 students is 35 kg. If the weight of the teacher be included, the average rises by 400g. The weight of the teacher is

The correct option is C 45 kgTotal weight of 24 students =24×35=840kgTotal weight of 25 persons with teacher =25×35.4=885kg.∴ Weight of teacher =(885−840)kg=45kg.

The correct option is C 45 kg
Total weight of 24 students $= 24 \times 35 = 840 k g$
Total weight of 25 persons with teacher $= 25 \times 35.4 = 885 k g$ .
$∴$ Weight of teacher $= (885 - 840) k g = 45 k g$ .