CGL 2012 Tier 2 Preparations and Results

Staff Selection Commission (SSC) SSC - CGL
41
@sscjindabad said:

ABCD is a trapezium with AB parallel to CD. AC is perpendicular to BC and BD is perpendicular to AD. If AD=BC=15cm and AB=25cm , find the area of the trapezium ABCD.

Somebody explain this also

Ans 192

yr D se 1 perpendicular darw karo AB tak......
Now 1/2*AD*DB = 1/2*AB*DM
u will get DM = 12, then by pythagorus find AM = 9
Now area of trapezium = area of ADB + area of BCD
= 150 + 1/2*DC*12 =192.....
42
@rahulshaitan :

1) e
2) a
3) a
4) 16 2/3
??
43

Direct to Indirect speech
I said to him, €˜Were you present at the meeting yesterday? €™

44
@JS-M said: What will be the least number of complete years in which a sum of money put on 20% compound interest will be more than double of itself??
72/20= 3.6 hence 4yrs ???
45
@sandy73 said: Direct to Indirect speech I said to him, €˜Were you present at the meeting yesterday? €™
I asked him if he was present in the meeting yesterday ??
46
A sum when placed at compound interest doubles itself in 3 yr. In how many years will it be amount to six times of itself?
47

My take
I asked him if he had been present at the meeting the day before.
Is this right?

48
@sandy73 said: Direct to Indirect speech I said to him, €˜Were you present at the meeting yesterday? €™
I asked him if he was present at the meeting the day before..
49
@sscjindabad said:
How did u find the "in triangle ABD using formula for cos we can find angle BAD".I mean how did u find
yaar triangle ABD is a right angled triangle so we can use the formula for cos i.e base/hypotenuse
50
@sandy73 said: Direct to Indirect speech I said to him, €˜Were you present at the meeting yesterday? €™
I asked him whether he had been present in the meeting the previous day...
51
@Brooklyn
Dude, change yesterday to the day before
52
@Brooklyn said:
72/20= 3.6 hence 4yrs ???
I also got the same but plz explain ur method???
53
@JS-M said: What will be the least number of complete years in which a sum of money put on 20% compound interest will be more than double of itself??
4 years..
54
@sandy73 said: Direct to Indirect speech I said to him, €˜Were you present at the meeting yesterday? €™ I asked him whether he had been present in the meeting the previous day??
55
@sscjindabad : std method !! to find the tym in which amt doubles :

72/r where r is in %age n 1 condition:

r>5%

@sandy73 said: @Brooklyn Dude, change yesterday to the day before
thnx my bad

56
@007pagal said:
yaar triangle ABD is a right angled triangle so we can use the formula for cos i.e base/hypotenuse
What angle did u get n how???
57
@JS-M said: A sum when placed at compound interest doubles itself in 3 yr. In how many years will it be amount to six times of itself?
doubles in 3 hence will become 4 times in 6 yrz. Now 4*2=8 n 4*1/2= 2

so we need 6 hence in 1.5 yr more it will be 6 times,

hence ans= 7.5 yr ???
58
@Dusky said:
4 years..
Plz explain using formula...i e amount(A)=P(1+r/100)^n
59

For Trigonometry sharing the links I found useful :


http://www.analyzemath.com/trigonometry/trigonometric_formulas.html ... Trigo formulas

http://www.trigonometry-help.net/basictrigonometry.php .... have various links ... check as per your requirement

Also attaching the pdf files for the formulas... may not be all relevant for SSC level, but knowing it will certainly help save time...
60
@sscjindabad said:
Plz explain using formula...i e amount(A)=P(1+r/100)^n
Yes yar.. the same formula.. nothing new..
after solving u'l get
2 = (6/5)^n
need to find the n but no direct method
u need to multily 6/5 4 times with itself to get the ans more than 2 as the question demands.
So the ans = 4yrs