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The average age of 5 persons in a group is increased by 10 years when two men aged 30 years and 40 years are substituted by two women. Find the average age (in years) of the two women.

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Important Questions on Average

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The average temperature for Wednesday, Thursday and Friday was 20°C. The average for Thursday, Friday and Saturday was 21°C. If the temperature on Saturday was 22°C, what was the temperature on Wednesday?
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The speed of the train in going from Kanpur to Lucknow is 60km/hr while when coming back from Lucknow to Kanpur, its speed is 40 km/hr. Find the average speed (in km/hr) during the whole journey.
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The average weight of class of 19 students is 20 kg. If the weight of the teacher be included, the average rises by 1 kg. What is the weight of the teacher?
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The average of 3 numbers is 20 and that of the first two is 25. Find the third number.
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The average weight of 29 men in a ship is increased by 5 kg when one of the men, who weighs 120 kg, is replaced by a new man. Find the weight of the new man (in kg).
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The age of A and B is the ratio 1:3. After 10 years, the ratio of their ages will become 1:2. Find the average of their ages after 20 years.
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Find the average of the first 100 natural numbers.
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Find the average of all prime numbers between 20 and 50.