# Aptitude - Aptitude-Average And Interests

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There are Indians and Europeans in an army of 12,000, The average height of europeans is 5'10 and that indians is 5'9 and the average height of the entire army is 5'39'4''.find out the number of indians in the army ?

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The mean of marks secured by 25 student in section A of class X is 47, that of 51 students of section B is and That of 30 students of section C is 53. Find the mean of marks of the students of three section of class X ?

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There maths classes : X,Y,z take angebra test. The average score of class X is 83. The average score of class Y is 76 . The average score of class Z is 85. The average score of class X and Y is 79 and average score of class Y and Z is 81. what is average score of classes X,y,Z ?

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let number of students in classes X,Y and Z be a,b,c respectively. Then \ntotal score of X =83a\ntotal score of Y =76b \ntotal score of Z =85c \n(83a+76b)/(a+b)=7a\n4a=3b\nand (76b+85c)/b+c =81\n4c=5b\nb=4/3a, c=5/3a\nverage score of X,Y,Z\n=(83a+76b+85c)/a+b+c\n=978/12=81.5

A shipping clerk has five boxes of diffierent but unknow weights each weighing less than 100 kg. the clerk weight the boxes in pairs, The weights obtained are 110,112,113,114, 115,116,117,118,120 and 121 kg. what of the heaviest box?

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Total expenses of a boarding house are partly fixed and partly varying linearly with the number of boarders. The average expense per boarder is Rs. 700 when there are 25 boarders and Rs. 600 when there are 50 boarders. what is the average expense per boarder when there are 100 boarders ?

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