CHSL & FCI PREPARATION

Jobs & Careers
670
@surya003 said:
2. solve this!!!
A is thrice as good as workman as B and therefore is able to finish a job in 60 days less than B. Working together, they can do it in:
A. 20 days B. 22 (1/2) days
C. 25 days D. 30 days
hi bro again the easy one took 30 second on most.
EFFICIENCY
A: B
3:1
WORK IN DAYS
A:B
1:3

SO A HAS TAKEN 1X DAYS
WHILE B HAS TAKEN 3X DAYS

NOW we are given with their difference.
3x-x=60days
2x=60
x=30

now we know that
A completes a work in 30
AND B IN 90 DAYS.

LCM( total work) = 90

A one days work is 90/30 = 3
B one days work is 90/90=1

if they will work together

90(total work)/ (3+1)(work together in one day)

90/4= (22)1/2


671
@surya003 said:
2. solve this!!!
A is thrice as good as workman as B and therefore is able to finish a job in 60 days less than B. Working together, they can do it in:
A. 20 days B. 22 (1/2) days
C. 25 days D. 30 days
diffrence b/w no of days taken by a and b = 2*x= 60 x= 30 ( a takes x days and b 3x days)
solve
days taken by a = 30
days taken by b = 90
together (30*90)/(30+90) = 22.5
672

abe aaj koi question hi nahi hai so gaye kya sab


673
@mukul1988 said:
abe aaj koi question hi nahi hai so gaye kya sab
bhai sorry.. aaj thoda busy tha...ab start kar raha hu...question post karna.
674

1. The number of zero in 18!

a. 4
b. 6
c.3
d.8


2. The number of zero in 25 ! is
a.4
b.6
c.9
d.7

675

The number of zero in 18! is

a. 4
b.3.
c. 6
d. 8
676
all bhai log aa jao.. toot pado

Q1 and Q2
first one is asking for increasing order

2nd is asking for decreasing order.
677
@surajpandey kaga
678
@custom said:
The number of zero in 18! is
a. 4
b.3.
c. 6
d. 8
18! = 6402373705728000 so , 5 zeros
679

hello puys there is some problem in PG today.. so i will suggest you not to solve the problems today.. as it late posting and getting error messages.,

what do you think?

680
@gautam7821 said:
18! = 6402373705728000 so , 5 zeros
bhai 3 zero... and this is the not the right way for these kinda questions.

follow this ways.
18!
divide by 5

18/5= 3 i.e the answer


25!
divide by 5

25/5= 5
now again it could be divide by 5

5/5= 1

so in total 5+1= 6 zeros.


this is the shortest method of all.
681

hello to all

try this..
NUMBER SYSTEM
Q1 and 2 for the day 2

1. asking for increasing orders

2. asking for decreasing orders

682
@surajpandey post kar problem
683
@surajpandey said:
bhai 3 zero... and this is the not the right way for these kinda questions.follow this ways. 18! divide by 518/5= 3 i.e the answer25! divide by 525/5= 5 now again it could be divide by 55/5= 1so in total 5+1= 6 zeros.this is the shortest method of all.
Is the question asking for last 0s ??
684
@gautam7821 said:
Is the question asking for last 0s ??
yes bhai
685
@custom said:
1. The number of zero in 18!
a. 4
b. 6
c.3
d.8
2. The number of zero in 25 ! is
a.4
b.6
c.9
d.7
For finding no of zeros in n!
n/5 + n/25 + n/125 ...... n /5^x (jahan tak ho sake) take round values

1. 18!
18/5 + 18/25 = 3+ 0 = 3 zeros

2. 25!
25/5 + 25/25 = 5 + 1 = 6 zeros
686

3 (i) 3/7 , 4/9 , 1/2 , 3/5


(ii) 5/8

comapre 2/3=12/18 and 13/18 so 2/3
compare 5/8=50/80 and 7/10= 56/80 so 5/8
compare 7/10=21/30 and 2/3=20/30 so 2/3

hence
687
@gautam7821 said:
3 (i) 3/7 , 4/9 , 1/2 , 2/5
bhai galat hai dhyan se karo...and post your methods for calculating this.
i'v translated also at the main question incase you have any problem with hindi.
688
@gautam7821 said:
3 (i) 3/7 , 4/9 , 1/2 , 3/5
3/7 and 4/9 is less than 1/2 ie .5 and 3/5 is greater than 1/2

So compare 3/7 = 27/63
4/9 = 28/63

hence 3/7
689

Q3.

now all the questions will be in english.