Is this a typo? Analog to digital sensor

[orangeincup]

Homework Statement

See picture.

The Attempt at a Solution

So, based on the two questions I looked at the graph and calculated the corresponding values
a) 40 cm
b) 200

I checked the solutions which say:
a) 40 cm
b) 20 cm

Is their answer for b) a typo, or am I reading it incorrectly?

 

[jedishrfu]

I think your answer is right.

My guess is that initially the second question was similar to the first ie given readout lookup distance and was rewritten to do the reverse lookup of given distance lookup readout and the answer was never updated. If they had left the units of measure in the answer we would have known for sure.