MathRevolution wrote:
[GMAT math practice question]
Alice works from Monday to Friday only. How many days does she work in April?
1) April 1 is Saturday or Sunday
2) April 28 is Saturday or Sunday
Question : How many days does she work in April?Statement 1: April 1 is Saturday or SundayCase 1: April 1 is SUNDAY
April has 30 days in calander
Sunday = April 1, 8, 15, 22, 29
Working days between 1st to 29th April = 5*4 = 20 days
and 30th April is Monday = 1 more working day
i.e. Total Working days = 21
Case 2: April 1 is SATURDAY
April has 30 days in calander
Saturday = April 1, 8, 15, 22, 29
Working days between 1st to 29th April = 5*4 = 20 days
and 30th April Sunday = 0 more working day
i.e. Total Working days = 20
NOT SUFFICIENT
Statement 2:April 28 is Saturday or SundayCase 1: April 28 is SUNDAY
April has 30 days in calander
Monday = April 1, 8, 15, 22, 29
Working days between 1st to 28th April = 5*4 = 20 days
and 29th and 30th April Monday and Tuesday = 2 more working day
i.e. Total Working days = 22
Case 2: April 28 is SATURDAY
April has 30 days in calander
Sunday = April 1, 8, 15, 22, 29
Working days between 1st to 29th April = 5*4 = 20 days
and 30th April Monday = 1 more working day
i.e. Total Working days = 21
NOT SUFFICIENT
Combining the two statements:As per statement 1: Working days = 20 or 21
As per statement 2: Working days = 22 or 21
i.e. Total Working days = 21
SUFFICIENT
Answer: option C