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The average weight of 12 parcels is 1.8 kg. Addition of another new parcel reduces the average weight by 50 g. What is the weight of the new parcel ?
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- 1.50 kg
- 1.10 kg
- 1.15 kg
- 1.01 kg
- 1.50 kg
Correct Option: C
The average weight of 12 parcels = 1.8 kg
Total weight 12 parcels = 12 × 1.8 = 21.6 kg.
when addition of another new parcel reduces the average weight by 50 g.
∴ New average of 13 parcels = 1.8 – 0.05 = 1.75 kg.
Total weight of 13 parcels = 13 × 1.75 = 22.75 kg.
∴ Weight of new parcel = 22.75 – 21.6 = 1.15 kg.
Second method to solve this question with the help of given formula :
| Here, T = 1.8, N= (12 + 1) = 13 ,t = | = 0.05 | |
| 1000 |
Weight of new parcel = T – Nt
Weight of new parcel = 1.8 – 13 × 0.05
Weight of new parcel = 1.8 – 0.65 = 1.15 kg
