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
question 2
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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)
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)