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7. In a certain ,month of a certain year, Yezz celebrated his 25th birthday which fell on a Sunday. In which month was he born?

1: In the previous month of the same year, the day of the month on which he was born fell on a Thursday.

2: In the next month of the same year, the day of the month on which he was bron fell on a Wednesday.

Prize: HOW WOULD YOU MOVE MOUNT FUJI? Microsoft's Cult of the Puzzle HOW THE WORLD'S SMARTEST COMPANIES SELECT THE MOST CREATIVE THINKERS a very good book...........

C it is
The distance between two days with the same number of the neighbouring months must be 28 or 29 or 30 or 31 days

(1) alone
His birthday fell in Sunday and in the previous month of the same year, the day of the month on which he was born fell on a Thursday so the distance betwwen these two days must be 31 days. This means that the previous month of the one in which Yezz was born must has 31 days.
(2) alone
Also tell that the distance between his birthday and the day of the month on which he was born in the next month of the same year must be 31 days.
This means that the month in which he was born must has 31 days.
(1)or (2) alone tells us nothing but (1) (2) together conclude that Yezz was born in August. Because there are just neighbouring months of July and August which both have 31 days and
stay in the same year.

Combining 1 and 2 seems suff but is not.. It does not hold true for the following ex

Consider a can finish the work in 3 days so in one day he finishes 1/3
Consider that b can finish the work in 2 days so in one day it finishes 1/2
Now a has to finish remaning 1/6 of the work that would require him half a day so total comes to 2.5
Similarly if we solve for A and B for given values we should be able to reach an answer.