**Concept Logic = Short Tricks**

1. A man completed a certain journey by a car. If he covered 30% of the distance at the speed of 20km/hr, 60% of the distance at 40km/hr and the remaining distance at 10 km/hr; his average speed for the whole journey was

(a) 25 km/hr (b) 28 km/hr

(c) 30 km/hr (d) 33 km/hr

2. The area of a circle of a radius 5 is numerically what percent of its circumference?

(a) 200 (b) 225

(c) 240 (d) 250

3. In an examination, 35% of the candidates failed in Mathematics and 25% in English. If 10% failed in both Mathematics and English, then how much percent passed in both the subjects ?

(a) 50 (b) 55

(c) 57 (d) 60

4. The measure of each angle of a regular hexagon is:

(a) 90� (b) 120�

(c) 105� (d) 135�

5. The difference between the exterior and interior angles at a vertex of a regular polygon is 150�. The number of sides of the polygon is :

(a) 10 (b) 15

(c) 24 (d) 30

6. The price of sugar rise by 25%. If a family wants to keep their expenses on sugar the same as earlier, the family will have to decrease its consumption of sugar by

(a) 25% (b) 20%

(c) 80% (d) 75%

7. The price of an article is reduced by 25% but the daily sale of the article is increased by 30%. The net effect on the daily sale receipts is :

(a) increase (b) decrease

(c) 2 % increase (d) 2% decrease

8. The cost of an article was Rs 75. The cost was first increased by 20% and later on it was reduced by 20%. The present cost of the article is

(a) Rs. 72 (b) Rs. 60

(c) Rs. 75 (d) Rs. 90

9. Four years ago, the ratio of A’s age to B’s age was 11 : 14 and four years later their ages will be in the ratio 13 : 16. The present age of A is

(a) 48 years (b) 26 years

(c) 44 years (d) 28 years

10. In an alloy, zinc and copper are in the ratio 1 : 2. In the second alloy, the same elements are in the ratio 2 : 3. If these two alloys be mixed to form a new alloy in which two elements are in the ratio 5 : 8, the ratio of these two alloys in the new alloys is

(a) 3 : 10 (b) 3 : 7(c) 10 : 3 (d) 7 : 3

**(1)Find the average of first 5 prime
numbers.**

* a) 5.6*** b) 5.5 c)
6.5 d) 4.6**

**(2) The average weight of a class having
52 students is 52 kg. Find the total weight of the class.**

**a) 2504 kg b) 2708 kg ***c)
2704 kg* d) 2407 kg

**(3) If the sum of x number of quantities
is 162 and the average is 9. Find the value of x.**

*a) 18*** b) 28 c) 19 d)
17**

**(4) A student bought 4 books for Rs 120
from one book shop and 6 books for Rs 150 from another. The average price (in rupees),
he paid per book was**

**a) Rs 27 b)
Rs 27.50 c) Rs 135 ***d)
Rs 138*

**(5) A group of 20 girls has average age
of 12 years. Average age of first 12 from the group is 15 years. What the
average age of other 12 girls in the group?**

**a) 10 b)
11 c) 11.5 ***d) 10.5*

**(6) The average age of 24 students and
the class teacher is 16 years. If the class teacher’s age is excluded, the
average reduces by 1 year. What is the age of the class teacher?**

**a) 50
years b) 45 years ***c)
40 years* d) Data Inadequate

**(7) The average of 15 numbers is 25. If
5 are added to each given number, what will be the new average?**

**a) 20 b)
30 c) 25 d) DI**

**(8) The averages of age 34 boys in class
its 14. If the teacher’s age is **

**Included the
average age of the boys and the teacher becomes 15 years. What is the teacher’s
age?**

** a) 48 years b) 46 years ***c) 49 years* d) 45 years