A. 11
B. 10
C. 12
D. 17
Sum of 10 odd no. = 100
Average = 100/10 = 10
A. 4 1/6 %
B. 6 1/6 %
C. 8 1/3 %
D. 20 %
Explanation:
C.P. of 1 kg = 420/7 = Rs. 6
S.P. of 1 kg = Rs. 6.50
Gain % = 0.50/6 * 100 = 25/3 = 8 1/3 %
A. 120
B. 180
C. 200
D. 280
Explanation:
80* 7: x* 3 = 1:1 1/2
560: 3x = 2: 3
x = 280
A. 1 min
B. 2 min
C. 3 min
D. None
Explanation:
Time for one revolution = 60/15 = 4
60/ 20 = 3
60/48 = 5/4
LCM of 4, 3, 5/4
LCM of Numerators/HCF of Denominators =
60/1 = 60
A. 4:3
B. 4:2
C. 4:4
D. 6: π
A. 40 %
B. 32 %
C. 22 %
D. 8 %
Explanation:
Let A = set of students who play football and
B = set of students play cricket.
Then n(A) = 40, n (B) = 50 and
n(A U B) = (100 – 18) = 82
n(A U B) = n(A) + n(B) – n(A ∩ B)
n(A∩B) = n(A) + n(B) – n(AUB) = (40 + 50 -82) = 8
Percentage of the students who play both = 8%
A. 2h
B. 4h
C. 2h/3
D. 3h/2