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In seven given numbers, the average of first four numbers is and that of last four numbers is also . If the average of these seven numbers is , the find the value of fourth number:
(a)
(b)
(c)
(d)

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Important Questions on Averages
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What is the average of first 1947 even numbers?

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is the average marks obtained by students. The average marks of successful candidates was , and that of unsuccessful candidates was . What is the number of successful candidates in that examination?

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An object travels meters in seconds and meters in the next two seconds. What is the average speed of the object?

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