On a weighing machine, Alex's weight was determined to be $62 kg$ . After stepping away from the machine, Alex noticed that the reading displayed on the machine was $3 kg$ rather than $0$ . What is Alex's correct weight?

65 kg

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56 kg

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68 kg

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59 kg

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Solution

The correct option is D $59 kg$
Given:
Weight of Alex with zero error, $W_{f} = 62 kg$
Zero error, $z = 3 kg$

Zero error is equal to the value of the reading when there is no load (and has the same sign). This means that the final reading is the sum of the actual weight and the zero error.

Let the actual weight of Alex be $W_{i}$ .
$W_{f} = W_{i} + z$
$W_{i} = W_{f} - z$
$W_{i} = (62 - 3) kg$
$W_{i} = 59 kg$

Hence, actual weight of Alex is $W_{i} = 59 kg$ .

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On a weighing machine, Alex's weight was determined to be 62 kg. After stepping away from the machine, Alex noticed that the reading displayed on the machine was 3 kg rather than 0. What is Alex's correct weight?​

On a weighing machine, Alex's weight was determined to be $62 kg$ . After stepping away from the machine, Alex noticed that the reading displayed on the machine was $3 kg$ rather than $0$ . What is Alex's correct weight?