Data Sufficiency

anyway,
heres how the graph would look

hey, man I've checked my suitcase of graphs again and have to insist on E as the final go and not C

Here's why - we checked discriminant and it's not 0 (D=25). The only case when the graph touches x-axis at one point is when D=0 in all other cases D>0 there are always two x-intercepts, D<0 not any intercept ever

experts please comment whether it's C or E

rijul007 wrote:anyway,
heres how the graph would look

pemdas wrote:hey, man I've checked my suitcase of graphs again and have to insist on E as the final go and not C

Here's why - we checked discriminant and it's not 0 (D=25). The only case when the graph touches x-axis at one point is when D=0 in all other cases D>0 there are always two x-intercepts, D<0 not any intercept ever

experts please comment whether it's C or E

rijul007 wrote:anyway,
heres how the graph would look

true
and that is exactly why i got 2 intercept points as shown in the graph


I would stick to C because the two points are always the intercepts

Anurag@Gurome wrote:

snakedoc wrote:(4) The ratio of women to children on a tour is 5:2. How many men are there?
a. Ratio of children to women is 5:11
b. There are less than 30 women on the tour.

Let no. of women = W, no. of men = M, and no. of children = C
Then W : C = 5 : 2, we have to find M = ?

(1) C : W = 5 : 11
So, W : C : M = 25 : 10 : 22, but we do not know how many men are there; NOT sufficient.

(2) There are less than 30 women on the tour does not give us the no. of men; NOT sufficient.

Combining (1) and (2), we know that no. of women = 25, so no. of men = 22; SUFFICIENT.

The correct answer is C.

Can someone please explain as to how we got the ratio
W : C : M = 25 : 10 : 22 from C : W = 5 : 11
it is really confusing.

nskandan wrote: Can someone please explain as to how we got the ratio
W : C : M = 25 : 10 : 22 from C : W = 5 : 11
it is really confusing.

Just to correct the typo, it is W : C = 5 : 2
C : M = 5 : 11

W....C....M
5....2
.....5....11
_____________
25...10...22
So, W : C : M = 25 : 10 : 22

1) In the xy plane, at what point does y = (x + a)(x + b) cross the x axis?
a. a + b = -1
b. graph intersects y axis at (0, -6)

2) S is finite set of numbers. Does S contain more negative numbers than positive numbers?
a. Product of all numbers in S is -1200
b. There are 6 numbers in S


3) Each employee is either a director or a manager. What % of the employees are directors?
a. The average salary of managers is $5000 less than the average of all employees
b. The average salary of directors is $15000 greater than the average of all employees


4) The ratio of women to children on a tour is 5:2. How many men are there?
a. Ratio of children to women is 5:11
b. There are less than 30 women on the tour.


5) Sum of positive integers x and y is 72. What is xy?
a. x = y + 1
b. x and y have same tens digit



Got the third one wrong, thanks
Anurag@Gurome
for a good explantion...