A thermometer is used to measure the temperature of warm water as shown below. The temperature recorded by the thermometer is______.

123℉

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121.5℉

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122.5℉

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123.5℉

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Solution

The correct option is B 121.5℉
In the given thermometer,
There are 10 divisions between 120℉ and 125℉
So, 10 divisions are equivalent to 5℉
1 division = 0.5℉
Now the mercury level in the thermometer is at three divisions above the 120℉
The reading of the thermometer will be 120℉ + 3 division x value of 1 division
= 120℉ + 3 x 0.5℉
= 120℉ + 1.5℉
=121.5℉
Thus, the temperature recorded by the thermometer is 121.5℉.

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