The average weight of A, B and C is 45 kg. If the average weight of A and B be 40 kg and that of B and C be 43 kg, then the weight of B is :

17 kg

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20 kg

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26 kg

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31 kg

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Solution

The correct option is D 31 kg
Total weight of A, B, C = $45 \times 3 = 135$ $k g$
Total weight of A and B = $40 \times 2 = 80$ $k g$
Total weight of B and C = $43 \times 2 = 86$ $k g$
Weight of B = $80 + 86 - 135 = 31$ $k g$

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The average weight of A, B and C is 45 kg. If the average weight of A and B be 40 kg and that of B and C be 43 kg, then the weight of B is :

The correct option is D 31 kgTotal weight of A, B, C = 45×3=135 kgTotal weight of A and B = 40×2=80 kgTotal weight of B and C = 43×2=86 kgWeight of B = 80+86−135=31 kg

The correct option is D 31 kg
Total weight of A, B, C = $45 \times 3 = 135$ $k g$
Total weight of A and B = $40 \times 2 = 80$ $k g$
Total weight of B and C = $43 \times 2 = 86$ $k g$
Weight of B = $80 + 86 - 135 = 31$ $k g$