Problem Solving

Stuck in them

Solution of maths 4.jpg


Let thr right hand player and left hand player be 45 each

2/3rd player absent means 1/3rd present


30 players out of this 1/ 3 are left handed So 10 Left hand player and 20 right hand player

ratio of the player that was not present that day Number of right hand/ number of left hand
25/35

Ans=> 5/7

Thanks for explaining, I didn't know you can just assign them a no. and work on it, but hey thanks!

Math Capture3.JPG:- Iam not able to understand this percentile system , Can anybody please explain me:)


first one :- 1/2*4*h=12

h=6

means Y intercept = 6



When there will be positive and when there will be negative slope? Confused:(

sixpointer wrote:Math Capture3.JPG:- Iam not able to understand this percentile system , Can anybody please explain me:)


first one :- 1/2*4*h=12

h=6

means Y intercept = 6



When there will be positive and when there will be negative slope? Confused:(

Your approach to the problem is Good!! Let me clear your idea about Slope.

See below 3 lines are there in the picture.

1. Red: Angle subtended by this line with X axis is less than 90. Slope is +ve. (Remember trigonometry? TAN(angle) is the slope)
2. Blue: Angle subtended by this line with X axis is equal to 90. Slope is infinite(cannot be determined).
3. Green: Angle subtended by this line with X axis is greater than 90. Slope is -ve.

Now try solving the actual problem. You are almost there but as of now your answer is wrong

N:Dure wrote:Mathcapture 3
Amy's grade was the 90th percentile of the 80 grades for her class. Of the 100 grades from another class, 19 were higher than Amy's and the rest were lower. If no other grade was the same as Amy's grade, then Amy's grade was what percentile of the grades of the two combined?

90th percentile out of 80 means, out of 80 people 100 - 90 = 10% people are above Amy in grade. Thus 80*10/100 = 8 people are ahead Amy.

Of the 100 grades from another class, 19 were higher than Amy's and the rest were lower.

Total students = 100 + 80 = 180

Total students ahead of Amy = 19+8 = 27

So Amy grade is at (180-27)/180 = 85th percentile.

Thus answer is D

shovan85 wrote:

sixpointer wrote:Math Capture3.JPG:- Iam not able to understand this percentile system , Can anybody please explain me:)


first one :- 1/2*4*h=12

h=6

means Y intercept = 6



When there will be positive and when there will be negative slope? Confused:(

Your approach to the problem is Good!! Let me clear your idea about Slope.

See below 3 lines are there in the picture.

1. Red: Angle subtended by this line with X axis is less than 90. Slope is +ve. (Remember trigonometry? TAN(angle) is the slope)
2. Blue: Angle subtended by this line with X axis is equal to 90. Slope is infinite(cannot be determined).
3. Green: Angle subtended by this line with X axis is greater than 90. Slope is -ve.

Now try solving the actual problem. You are almost there but as of now your answer is wrong

Thanks , So answer will be -6

sixpointer wrote:Math Capture3.JPG:- Iam not able to understand this percentile system , Can anybody please explain me:)


first one :- 1/2*4*h=12

h=6

means Y intercept = 6



When there will be positive and when there will be negative slope? Confused:(

you are doing good...

the two points are now (4,0) & (0,6)

Slope = y2 - y1/ x2-x1

slope = 6/-4 = -3/2

but since the question says that they have a positive slope, hence y intercept = -6

So Amy grade is at (180-27)/180 = 85th percentile.

How did u get down to 85th percentile? plz explain...

kawan84 wrote:So Amy grade is at (180-27)/180 = 85th percentile.

How did u get down to 85th percentile? plz explain...

percentile is always on 100... 153/180*100 = 85