A bicycle wheel makes 5000 revolutions in moving 11 km. The diameter of the wheel (in cm) is
35
55
65
70
D.
70
∴ Diameter of the wheel = 70 cm.
At each corner of the triangular filed of sides 26 m, 28 m and 30 m, a cow is tethered by a rope of length 7m. The area (in m2) ungrazed by the cows is
336
259
154
77
A shopkeeper allows 23% commission on his advertised price and still makes a profit of 10%. If he gains ₹ 56 on one item, his advertised price of the item (in ₹) is
820
780
790
800
The single discount equal to three consecutive discount of 10%, 12% and 5% is
26.27%
24.76%
9%
11%
An alloy contains copper, zinc and nickel in the ratio of 5 : 3 : 2. The quantity of nickel in kilogram that must be added to 100 kg of this alloy to have the new ratio 5 : 3 : 3 is
8
10
12
15
The ratio of the ages of Ram and Rahim 10 yr ago was 1 : 3. The ratio of their ages 5 yr hence will be 2 : 3. Then, the ratio of their present ages is
1 : 2
3 : 5
3 : 4
2 : 5
The incomes of A, B and C are in the ratio 7 : 9 : 12 and their spending are in the ratio 8 : 9 : 15. If A saves 1/4 of his income, then the saving of A, B and C are in the ratio of
69 : 56 : 48
47 : 74 : 99
37 : 72 : 49
56 : 99 : 69
Out of 4 numbers, whose average is 60, the first one is one-fourth of the sum of the last three. The first number is
15
45
48
60
The average of 25 observations is 13. It was later found that an observation 73 was wrongly entered as 48. The new average is
12.6
14
15
13.8