Kerala PSC Exam Training on Ranking and Time Sequences.

(1) Raju remembers that his father’s birthday is between 13th and 16th June, whereas his sister remembers that their father’s birthday between 14th and 18th of June. On which day i their father’s birthday?

Ans: 15th June

(2) Gopan Ranks 16th from the top and 49th from the bottom in a class. How many students are there in the class?

Ans: 64

(Total no. of students in the class =(16+49)-1

=65-1=64

or

15+48+1 =64)

(3)In a class of 39 students, the ratio of boys and girls is 2:1 Radhika ranks 15th among all the students from top and 8th among girls from bottom. How many boys are there below Radhika?

Ans: 17

(No. of boys in the class = 39 x 2/3=26

No. of girls = 39-26 =13

Out of 24 students who are below Rdhika, 7 are girls.

No. of boys below Radhika = 24-7 = 17)

(4) In a row of boys, Vikas is fifth from the left and Prakash is 11th from the right. If Vikas is 25th from the right, then how many boys are there between Vikas & Prakash?

Ans: 13 boys

(Total no.of boys in the row = 5+25-1 = 29

No. of boys between Vikas & Prakash = 29 – (5+11) = 29-16 =13 boys

(5) Which number would replace the question mark in the series; 2,7,14,23,?,47

Ans : 34

(The give sequence is +5, +7, +9……..

i.e, 2+5 = 7, 7+7 = 14, 14+9 =23

Missing Number = 23+11 = 34.)

(6) Which is the number that comes next in the following series?

4, 6, 12, 14, 28, 30, ………

Ans : 60

(The given sequence is a combination of two series 4, 12, 28………. and 6, 14, 30….Clearly the number to be found belongs to the first series.