question 2

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question 2

by bacali » Wed Nov 26, 2008 9:01 pm
Yesterday Diana spent a total of 240 minutes attending a training class, responding to E-mails, and talking on the phone. If she did no two of these three activities at the same time, how much time did she spend talking on the phone?


(1) Yesterday the amount of time that Diana spent attending the training class was 90 percent of the amount of time that she spent responding to E-mails.

(2) Yesterday the amount of time that Diana spent attending the training class was 60 percent of the total amount of time that she spent responding to E-mails and talking on the phone.


OA: C

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by cramya » Wed Nov 26, 2008 9:47 pm
Let x be the training class time, y be the email time and z be the phoen time

x+y+z=240

Stmt I)
x=.90y

.90Y+Y+Z=240

1.90Y+Z=240 (1)

2 VARIABLES 1 EQN
INSUFF

Stmt II

x=.60(Y+z)

.60Y+.60Z+Y+Z=240 (2)

2 VARIABLES 1 EQN
INSUFF


Stmt I and II together:

2 different eqns 2 variables z can be solved

SUFF



No need to solve just for FYI
p.s email time(y) - 100 PHONE TIME(Z) = 50 training class(x) = 90

C)