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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:
A30
B28
C25
D20
উত্তর : C.
ভেরিফাইড25
সম্পর্কিত প্রশ্ন সমূহ
In a zoo, each pigeon has 2 legs, and each rabbit has 4 legs. The head count of the two species together is 12, and the leg count is 32. How many pigeons and how many rabbits are there in the zoo?
A.
4,8
B.
6,6
C.
6,8
D.
8,4
A train takes 8 seconds to cross a pole and 18 seconds to cross a platform of length 120m. What is the length of the train?
A.
80 m
B.
150 m
C.
200 m
D.
96 m
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
In a simultaneous throw of a pair of dice, what is the probability of getting a total more than 8?
A.
B.
C.
D.