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The average age of an adult class is 40 ...

The average age of an adult class is 40 years. 12 new students with an average age of 32 years join the class, thereby decreasing the average of the class by 4 years. Find the original strength of the class

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The average age of an adult class is 40 years.12 new students with an average age of 32 years join the class,thereby decreasing the average by 4 years.The original strength of the class was ( a ) 10 (b) 11 (c) 12 . (d) 15

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