A. 178
B. 7850
C. 5200
D. 4800
Explanation:
2578 + 20581 – 17889 = 2600 + 20600 – 18000
= 23200 – 18000 = 5200
A. 9 1/4 min
B. 11 1/4 min
C. 7 1/4 min
D. 8 1/2 min
Explanation:
3/12 + x/15 = 1
x= 11 1/4
A. 120 cm2
B. 130 cm2
C. 312 cm2
D. 315 cm2
The triangle with sides 26 cm, 24 cm and 10 cm is right angled, where the hypotenuse is 26 cm.
Area of the triangle = 1/2 * 24 * 10 = 120 cm2
A. 71
B. 70
C. 69
D. 68
Explanation:
LCM = 72
72 – 3 = 69
A. 5 kmph
B. 6 kmph
C. 7 kmph
D. 8 kmph
Explanation:
Speed downstream = d/t = 85/(2 1/2) = 34 kmph
Speed upstream = d/t = 45/(2 1/2) = 18 kmph
The speed of the stream = (34 – 18)/2 = 8 kmph
A. 160m × 27m
B. 240m × 18m
C. 120m × 36m
D. 135m × 32m
Let the side of smaller square at the extreme right be a
Then side of the larger square is 3a
Total area of the field = a2 + a2 +a2 + (3a)2 +(3a)2 = 30a2
Therefore, 30 a2 = 4320 => a2 = 432 / 3 = 144 => a = 12
Smaller side of the field = 36
Larger side of the field = (3a) × 3 + a = 10 a = 10 × 12 = 120
Original Dimensions of the field = 120m × 36m
A. 864 cm2
B. 648 cm2
C. 486 cm2
D. 468 cm2
Explanation:
a3 = 1728 => a = 12
6a2 = 6 * 12 * 12 = 864