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Pls explain and resolve these.....

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Pls explain and resolve these.....

by joefreddy » Sat Dec 29, 2007 10:15 pm
1)
If X - Y > 10. IS X + Y > X - Y?
1) X = 8
2) Y = -20

2)
MR A spent a total of 6.00 for one kind of cupcake and doughnut? How many doughnuts did he buy?
1) Price of 2 doughnuts was 0.10 less than price of 3 cupcakes
2) the avg price of 1 doughnut and 1 cake was 0.35

I thought the answer was C but the answer is E.

3)

The Y intercept of line L is 4. If the slope is negative which of the following could the the X intercept.

a) -1
b) 0
c) 6

Answer - C.
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Source: — Data Sufficiency |
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by rchadha7 » Sun Dec 30, 2007 11:03 am
1. ) D
x-y >10
now if x=8
8-y> 10 ie y < -2
8+(-2) <8>10 ie x > -10
-10 + (-20) < -10 -(-20)
now if you make x as -5, 0, 5, 10... same result


2.) E - Not very sure
qc pc + qd pd = 6
qc,qd - quantity of c and d
pc,pd - quantity of c and d

3pc - 2pd = .10 ------------ 1
(pc +pd )/2 = .25
pc + pd = .7 -----------2

solve 1 and 2 you get pc and pd..... but u still need qc if you want value
of qd....

3) c
This is simple .. 1 point is given (0,4) ie y intersect is 4...
slope = y2 -y1 / x2 - x1

for (6,0) ... where x intersect is 6
0-4 / 6-0 = -4/6 which is -ve ..

for all other values it is +ve or cannot be found for 0
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