There are 3 vacancies in a firm and 15 applicants. Find the total number of ways of filling these vacancies
3375
2730
560
600
None of these
Answer: Option B.
Reqd. number of ways = 15 × 14 × 13 = 2730
The number of ways of selecting four numbers from 1 to 30 so as to exclude every selection of four consecutive numbers is
27378
29465
26368
11448
None of these
Answer: Option A
.Reqd. number of ways = 30C4 – 27= 27378. Here 27 are the number of ways in which we can have 4 consecutive numbers
A train does a journey without stopping in 8 hours. If it had traveled 5 km an hour faster, it would have done the journey in 6 hours 40 min. What is its slower speed?
35 km/hr
25 km/hr
40 km/hr
20 km/hr
30 km/hr
Answer: Option B.
A person sets to cover a distance of 12 km in 45 minutes. If he covers 3/4 of the distance in 2/3 of time, then what is the speed in the remaining time?
16 km/hr
8 km/hr
12 km/hr
55 km/hr
10 km/hr
Answer: Option C.
If 8 men or 12 women can do a piece of work in 25days, in how many days, can the work be done by 6 men and 11 women working together?
Some men promised to do a job in 18 days, but 6 of them became absent and remaining men did the job in 20 days. What is the original number of men?
50 men
60 men
65 men
70 men
55 men
Answer: Option B.
Let the number of men originally = M. According to the given condition M * 18 = ( M – 6) * 20 =>M = 60
The product of the digits of a two-digit number is one-third of that number. If we add 18 to the required number we get a number consisting of the same digits written in reverse order. Find the number
42
24
72
27
None of these
Answer: Option A.
Go by options. 2nd option is correct because 24 = 3 *2 *4. Number is thrice the product of its digits.
Also 24 + 18 = 42. Hence digits are reversed.
Bill, Simon, and John are brothers, given Simon is the eldest. Bill is as many years younger than one brother as he is older than the other. Simon is 7 years younger than twice the age of John. John is 5 years older than half the age of Bill. What is the sum of the ages of Bill, Simon and John?
12
24
48
42
Can’t say
Answer: Option C.
S - B = B - J; J = B/2 + 5;
S = 2J - 7; S = B + 10 - 7 = B-3;
J= B/2 + 5 ; 2S =B + 10;
B/2 + 5 + B + 3 = 2B;
B/2 = 8 ; B = 16 ; S = 19 ; J = 13;
So B - S - J =16 - 19 - 13 = 48;
Cost price of each of the articles A and B is Rs. 'X'. Article A was sold at a profit of 10% and article B was sold at a profit of 30%. If the overall profit earned after selling both the articles is Rs. 136/-, what is the value of 'X'?
2
16
44
87
Answer: Option A.
Given : 0.1x + 0.3x = 136 => x = 340
Population of a village increased by 5% from 2007 to 2008 and by 25% from 2005 to 2009. If the population of the village was 480 in 2007, what was its population in 2009?