Question
Two cones X and Y of are melted together to form a
cylinder of height 48 m. The height of cones X and Y are in the ratio of 3:2 respectively and the radius of cone X is 5/6 of the radius of cone Y. The curved surface area of cylinder is 2112 cm 2 .Which of the following can be determined?I: Radius of cylinderII: Total surface area of cone XIII: Relation between radius and height of cone.Solution
Curved surface area of cylinder = 2112 cm 2
2 * 22/7 * R * 48 = 2112
R = 7 cm
Let height of cone X and Y are '3h' cm and '2h' cm respectively and radius of cone X and Y are '5r' cm and '6r' cm respectively.
1/3 * π [25r 2  *3h + 36r 2  *2h] = π*7*7*48
r 2 h = 48
I: Radius of cylinder = 7 cm
II: Total surface area of cone X cannot be determined.
III: Relation between radius and height of cone = r 2 h = 48 cm 3
A-5,  A,  35,  52, 78, 115
Find the wrong number in the given number series.
8, 12, 23, 40, 66, 103
15, 34, 13, 32, 11, 28
134, 138, 132, 142, 126, 146, 122
132, 148, 196, 340, 762, 2068
88, 112, 78, 120, 64, 136
- Find the wrong number in the given number series.
4, 6, 9, 13, 18, 25 4, 11, 36, 164, 986, 7204
In each of the following giving number series, a wrong number is given. Find out the wrong number?
46 23 23 34.5 70 172.5
...- Find the wrong number in the series.
2, 3, 7, 15, 31, 63, 127
