60% of a class are girls. The number of boys is 20. So, the strength of the class is 45.

True

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False

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Solution

The correct option is B False
The correct answer is 50.
The % of boys is 40 %. There are 20 boys. If the class strength was 100, the number of boys would be 40. Hence, if the number of boys was 20, class strength would be 50.

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