Answer :
To estimate the total weight of three people in an elevator given their weights are 195 lb, 127 lb, and 190 lb, follow these steps:
1. Add the weights of the three people together:
- Weight of the first person: 195 lb
- Weight of the second person: 127 lb
- Weight of the third person: 190 lb
2. Calculate the sum:
- [tex]\( 195 \text{ lb} + 127 \text{ lb} + 190 \text{ lb} = 512 \text{ lb} \)[/tex]
3. Compare the total weight to the given options to find the closest estimate:
- Option A: 750 lb
- Option B: 5000 lb
- Option C: 50 lb
- Option D: 500 lb
4. Determine the closest estimate:
- The actual total weight is 512 lb.
- Compare 512 lb to each option:
- Option A (750 lb) is 238 lb more than 512 lb.
- Option B (5000 lb) is 4488 lb more than 512 lb.
- Option C (50 lb) is 462 lb less than 512 lb.
- Option D (500 lb) is 12 lb less than 512 lb.
- The closest value to 512 lb is 500 lb (Option D).
Therefore, the best estimate for the total weight of the three people on the elevator is 500 lb. The correct answer is:
D. 500 lb
1. Add the weights of the three people together:
- Weight of the first person: 195 lb
- Weight of the second person: 127 lb
- Weight of the third person: 190 lb
2. Calculate the sum:
- [tex]\( 195 \text{ lb} + 127 \text{ lb} + 190 \text{ lb} = 512 \text{ lb} \)[/tex]
3. Compare the total weight to the given options to find the closest estimate:
- Option A: 750 lb
- Option B: 5000 lb
- Option C: 50 lb
- Option D: 500 lb
4. Determine the closest estimate:
- The actual total weight is 512 lb.
- Compare 512 lb to each option:
- Option A (750 lb) is 238 lb more than 512 lb.
- Option B (5000 lb) is 4488 lb more than 512 lb.
- Option C (50 lb) is 462 lb less than 512 lb.
- Option D (500 lb) is 12 lb less than 512 lb.
- The closest value to 512 lb is 500 lb (Option D).
Therefore, the best estimate for the total weight of the three people on the elevator is 500 lb. The correct answer is:
D. 500 lb
