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সম্পর্কিত প্রশ্ন সমূহ
The average of 8 numbers is 8. If 4 is subtracted from each of 6 of the numbers, what is the new average?
A.
3.5
B.
5
C.
4
D.
6.5
If the side of a square is increased by 10%, by what percent will the area be increased?
A.
16%
B.
21%
C.
32%
D.
100%
If the radius of a right cylinder is tripled and the height is reduced by 40%, then what would the percentage change in volume?
A.
320%
B.
440%
C.
460%
D.
540%
What is the angle between the hour and minute hands of a clock at 14:50?
A.
135°
B.
140°
C.
145°
D.
150°
The average of a non-zero number and its square is 5 times the number. The number is-
A.
9
B.
17
C.
29
D.
none of these
How many terms of the arithmetic progression 2,7,12,... should be taken so that their sum equals 354?
A.
10
B.
11
C.
12
D.
13
The H.C.F. of two number is 11 and their L.C.M. is 693. If one of the numbers is 77, find the other.
A.
99
B.
89
C.
79
D.
69
Silver is 17 times as heavy as water and copper is 7 times as heavy as water. In what ratio should these be mixed to get alloy 13 times as heavy as water?
A.
1 : 1
B.
2 : 3
C.
1 : 2
D.
3 : 2
The average of six numbers is 30. If the average of first four is 25 and that of last three is 35, the fourth number is:
A.
30
B.
28
C.
25
D.
20