ARITHMATIC MATHS CRASH COURSE FOR FREE AVERAGE (PART-4)

The mean of 9 observation is 16. One more observation is included and the new mean becomes 17. The 10th observation is a) 9 b)16 c) 30 d) 26

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In a class, the average score of girls in an examination is 73 and that of boys is 71. The average score for the whole class is 71.8. Find the percentage of girls. a) 50 b)40 c) 55 d) 60

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There are in all, 10 balls some of them are red and the others white. The average cost of all balls is Rs.28, average cost of red balls Rs.25 and that of white balls is Rs.30, the number of white balls is a) 5 b)7 c) 6 d)3

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On mixing two classes A and B of students having average marks 25 and 40 respectively, the over all the average obtained is 30. Find the ratio of the students in the classes A and B a) 2:1 b)5:8 c) 5:6 d)3:4

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4 boys and 3 girls spend Rs.120 on the average, of which boys spend Rs.150 on the average. Then the average amount spent by the girls is a) 80 b) 60 c) 90 d) 100

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In an examination average marks obtained by the girls of a class is 85 and the average marks obtained by the boys of the same class is 87. If the girls and boys are in the ratio 4:5, average of the whole class (approx.) is close to a) 86.5 b)86.4 c) 85.9 d)86.1

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Abhilash Kumar

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Teaching from 4 years in many recognize institutes of Kanpur.

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