The average of x number is y and average of y numbers is x. Then the average of all the numbers taken together is
(x+y)/2xy
2xy/(x+y)
(x2+y2)/(x+y)
xy/(x+y)
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1
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The average of the first five multiples of 9 is:
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2
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A shop of electronic goods is closed on Monday. The average daily sales for remaining six days of a week is Rs. 15,640 and the average sale of Tuesday to Saturday is Rs. 14,124. The sales on Sunday is -
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3
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The average marks obtained by a class of 60 students is 65. The average marks of half of the students is found to be 85. The average marks of the remaining students is :
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4
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The average of the first five multiples of 3 is-
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5
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The average (arithmetic mean) of 330, 360 and 390 is :
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6
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In a primary school the average weight of male students is 65.9 kg and the average weight of female students is 57 kg. If the average weight of all the students ( both male and female ) is 60.3 kg and the number of male students in the school is 66, what is the number of female students in the school?
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7
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The average temperature for Wednesday, Thursday and Friday was 40°C. The average for Thursday, Friday and Saturday was 41° C. If temperature on Saturday was 42° C, what was the temperature on Wednesday?
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8
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The average age of the boys in a class is 16 years and that of the girls is 15 years. The average age for the whole class is-
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9
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Average of two numbers is 8 and average of other three numbers is 3; the average of the five numbers is :
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10
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The average of two numbers is XY. If one number is X, the other is-
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