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Sofia

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Sofia

by greenwich » Tue Apr 30, 2013 10:02 am
Sofia will attend a sequence of daily training sessions for her job. On the last day of her training sessions she will attend either 1 session or 2 sessions. On each of the other days of her training sessions she will attend exactly 2 sessions. At the end of her third day of attending training sessions, how many sessions will Sofia have left to attend?

(1) The sequence of training sessions Sofia will attend will last 6 days
(2) There are a total of 11 training sessions in the sequence of training sessions Sofia will attend
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Source: — Data Sufficiency |
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by srcc25anu » Tue Apr 30, 2013 10:15 am
St1: Training to last 6 days
so 1st 5 days, Sophia will attend 5*2 = 10 sessions and on 6th day she could attend 1 or 2 sessions. After 3 days, She could either have 5 or 6 sessions to attend.
hence insufficient to answer

St2: Sophia to attend 11 training sessions. therefore from equation (n-1)*2 + 1 = 11 we get n = 6 days.
her training will last 6 days, 1st 5 days she attends 2 trainings per day and on 6th day she attends 1 training session.
after 3 days, Sophia will have 5 more sessions to attend.
SUFFICIENT

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