[prateek7563]

thnx for quick response

[Ankurb]

Originally Posted by shilpakokkanti

Hi Guyz,,
I am sorry.There's a typo mistake in the problem.

P and Q are two stations .train A started from P towards Q at 6.00 Am at 90kmph.At the same time,train B started from R,an intermediate station 60 km from P,and travelled towards Q at 60kmph.Train C started from Q towards P are 7.00 Am at 120 kmph.All the trains crossed each other simultaneously.Find PQ.?

PQ = 300
after 1hr a will be 30km behind B and will take 1hr to meet B.
total distance covered by A = 120. In the mean time C will cover 120km to meet B.
Total distance = 300

[priyalli]

Originally Posted by Ankurb

1.
option (2) 600
2.
option (2) 50 less
Population P = 12x, Q =30y
12x = 30y + 100
6x = 18y(studying students)
x = 3y = 50, y = 50/3

pls give the detailed solution and elaborate it step wis epls

[priyalli]

@Ankurab pls if u culd elaborate the solution ,,,,,,,,,
thanx in advance

[pillai.suraj]

When statement 1 holds, the length of the wire cant be more than 20 cm. Hence, we have an isoceles triangle of side 5cm, 5cm and 8cm (perimeter=18cm). Hence, the circumradius would be 2.5*2/sqrt(3).

Clearly ,since in the above case, the circumradius is not greater than 4cm , for statement 2 to hold, the sides of the triangle must be 8cm,8cm and 5 cm, in which case, the circumradius would be 4*2/sqrt(3).

[divishth]

Originally Posted by apocalyptic

Find the last digit of (1!)^1! + (2!)^2!......+(81!)^81!

its quite simple.....

all u hav to do is to check the last digit....

say for 1!^ 1 = 1
2!^2 = 4
3!^3 = 9
4!^4 = 16
5!^5 = 25


Similarly for every term u wud be getting the terms square....

add them using formaula

Sum = n(n+1)(2n+1) / 6

u will get last digit as 1/.....simple

[divishth]

Originally Posted by shreyans_nitt

H=6000
B=4000
X=3600

savings come as 4:1 na.....

How can savings be 4:1

Savings of H = 6000 - 3600 = 2400
Savings of B = 4000 - 3600 = 400

so Hs:Bs = 2400:400 = 6:1

[akhilmisra]

Originally Posted by shilpakokkanti

Hi Guyz,,
I am sorry.There's a typo mistake in the problem.

P and Q are two stations .train A started from P towards Q at 6.00 Am at 90kmph.At the same time,train B started from R,an intermediate station 60 km from P,and travelled towards Q at 60kmph.Train C started from Q towards P are 7.00 Am at 120 kmph.All the trains crossed each other simultaneously.Find PQ.?

P........................R........................ .Q
<--------------------x--->

let train A and B meet at 'x', since the started st the same time so they will take same time to reach 'x'

x/90 = (x-60)/60

=> x=180
time taken by A and B to reach x=180km
t=180/90 =2hrs (that means its 8:00 am now)

by this time the train C would have covered distance= 120km
since all three trains meet at the same time
PQ-x=120

therefore, PQ=180+120
=300kms

hope this helps....

[dillipmina]

Originally Posted by divishth

its quite simple.....

all u hav to do is to check the last digit....

say for 1!^ 1 = 1
2!^2 = 4
3!^3 = 9
4!^4 = 16
5!^5 = 25


Similarly for every term u wud be getting the terms square....

add them using formaula

Sum = n(n+1)(2n+1) / 6

u will get last digit as 1/.....simple

I think you are making a silly mistake here.......
1!^1=1
2!^2=4
3!^3=6^3=Last digit 6......
4!^4=24^4=Last digit 6.....
5!^5=120^5=Last digit 0......
After 5!,there will be alwayz b a 0 in units digit.....

So Units digit is 1+4+6+6=7....

[priyalli]

There are two Pand q .The population of village pexceeds that of village Qby 100 .The ratio of the number of males and that of emales in villages P and Q are 5:7 and 3:7 respectively .each person in the village belongs to exactly one cateory -employed ,unemployed and studying .The ratios of the number of the employed ,the unemployed and those who are studying in the two villages P and Q are 1:2:3 and 1:3:6 respectively .The number of those who are studying in the village are equal

Q>find the population of village P???
<1>500 <2>600 <3>550 <4>650 <5>700


Q>how many more /less unemployed people are there in village Q.when compared to that in village P?
<1> 50 more
<2>50less <3>20 more
<4>20 less


pls give a detailed solution