The least number, that must be added to 1720 so as to obtain a perfect cube, is?
(A) 7
(B) 8
(C) 11
(D) 13
The average of the marks obtained in an examination by 8 students was 51 and by 9 other students was 68. The average marks of all 17 students was?
(A) 59
(B) 59.5
(C) 60
(D) 60.5
If the average marks of three batches of 55, 60 and 45 students respectively is 50, 55 and 60, then the average marks of all the students is?
(A) 54.68
(B) 53.33
(C) 55
(D) None of these
If the length of the diagonal AC of a square ABCD is 5.2 cm, then the area of the square is?
(A) 15.12 sq.cm
(B) 13.52 sq.cm
(C) 12.62 sq.cm
(D) 10.00 sq.cm
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