How much water is stored in the beaker shown in the figure?

40 m l

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50 m l

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45 m l

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42 m l

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Solution

The correct option is B $50 m l$
From the figure, it can be noticed that the water is filled between $40 m l$ and $60 m l$ . Counting each sub division on scale, there are 4 sub divisions between every marked value in the problem figure.
This means value of each subdivision is
$\frac{60 - 40}{4} = 5 m l .$
Water is filled $2$ subdivisions above $40 m l .$
Which means the water level is $40 + (2 \times 5) = 50 m l .$

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