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__Averages Formulae__

1. Average

Average = (Sum of observations/Number of observations)

2. Average Speed

Suppose a man covers a certain distance at X kmph and an equal distance at Y kmph.

Then, the average speed during the whole journey is {2xy/(x+y)} kmph.

Average = (Sum of observations/Number of observations)

2. Average Speed

Suppose a man covers a certain distance at X kmph and an equal distance at Y kmph.

Then, the average speed during the whole journey is {2xy/(x+y)} kmph.

11. The average of first five prime numbers greater than 20 is?
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12. The average age of 8 men increases by 2 years when two women are included in place of two men of ages 20 and 24 years. Find the average age of the women?
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13. The average salary of workers in an industry is Rs.200 the average salary of technicians being Rs.400 and that of non-technicians being Rs.125. What is the total number of workers?
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14. A team of eight entered for a shooting competition. The best marks man scored 85 points. If he had scored 92 points, the average scores for. The team would have been 84. How many points altogether did the team score?
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15. The average age of M boys is 'b' years and of 'n' girls 'c' years. The average age of all together is?
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