At present the average age of 20 students of class ten is 15.5 years. The present age of the class teacher is 47 years. What will be the average age of the students and the class teacher after 5 years?
A21.8
B21.5
C22
D22.8
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Related Questions:
The average weight of 5 men is decreased by 3 kg when one of them weights 150 kg replaced by another person. This new person is again replaced by anther person whose weight is 30 kg lower than the person he replaced . What is the overall change in he average due to this dual change?
The average of 12 observations is 8. Later it was observed that one observation 10 is wrongly written as 13. The correct average of observation is.
24 വ്യക്തികളുടെ പ്രായങ്ങളുടെ ശരാശരി 35 വയസ്സാണ്. ഒരു വ്യക്തി കൂടെ ആ കൂട്ടത്തിൽ ചേർന്നപ്പോൾ ശരാശരി ഒരു വയസ് കൂടുന്നു. പുതിയതായി എത്തിയ വ്യക്തിയുടെ പ്രായം എത്ര?
What will be the difference between the sale price (in INR) of a book with a marked price
INR 1,500 under the following discount schemes?
(i) Two successive discounts of 20% each
(ii) Two successive discounts of 30% and 10%