A. 18 πr2 sq units
B. 3 πr2 sq units
C. 12 πr2 sq units
D. 6 πr2 sq units
2 * π * 2r * 3r = 12 πr2
A. 5 m
B. 7 m
C. 8 m
D. 44 m
A. 1% gain
B. 1% loss
C. 5% gain
D. No gain no loss
A. Rs. 6
B. Rs. 6.48
C. Rs. 7.02
D. Rs. 7.20
Explanation:
90 : 5.40 :: 120 : x
X = (5.40 x 120)/90 = 7.20
A. 1.4 m
B. 2.8 m
C. 14 m
D. None of these
A. 20
B. 25
C. 30
D. 32
39x = 5 + 12 + 15 + 19 + (x – 4)44
x = 25
A. 4
B. 5
C. 6
D. 8
E. None of these
Explanation:
If Bilal gives ‘x’ marbles to Arslan then Bilal and Arslan would have V – x and A + x marbles.
V – x = A + x — (1)
If Arslan gives 2x marbles to Bilal then Arslan and Bilal would have A – 2x and V + 2x marbles.
V + 2x – (A – 2x) = 30 => V – A + 4x = 30 — (2)
From (1) we have V – A = 2x
Substituting V – A = 2x in (2)
6x = 30 => x = 5.