A. 12 π cm3
B. 6 π cm3
C. 8 π cm3
D. 10 π cm3
A. 3:4
B. 4:3
C. 3:1
D. 1:3
4 πr2 : 3 πr2 => 4:3
A. 83 1/3
B. 16 2/3
C. 90
D. 60
p = 6q.
Thus, q is less than p by 5q
q is less than p by (5q/6q x 100)% = 83 1/3 %
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. 6
B. 24
C. 96
D. 720
A. 120
B. 200
C. 180
D. 150
E. None of these
Explanation:
Let the number be x.
30% of x = 30/100 * x = 3x/10
20% of x = 20/100 * x = x/5 = 2x/10.
Given that 3x/10 – 2x/10 = 18 => x = 180.
Required number is 180.
A. 18:11
B. 22:13
C. 23:12
D. 11:9
Explanation:
A invests Rs.8000 for 18 months, but B invests Rs.8000 for the first 4 months and then withdraws Rs.4000. So, the investment of B for remaining 14 months is Rs.4000 only.
A : B
8000*18 : (8000*4) + (4000*14)
14400 : 88000
A:B = 18:11