The following table shows the number of visitors to a library in the first six days of a week:

Days	Number of visitors
Monday	86
Tuesday	114
Wednesday	141
Thursday	95
Friday	124
Saturday	151

On which day, the number of visitors to the library was 29 more than its previous day?

The correct option is Friday.

To find the day on which the number of visitors was 29 more than the previous day, we calculate the difference in the number of visitors for each consecutive day:

Tuesday (compared to Monday):
$114-86=28$
The number of visitors increased by 28.

Wednesday (compared to Tuesday):
$141-114=27$
The number of visitors increased by 27.

Thursday (compared to Wednesday):
The number of visitors decreased from 141 to 95.

Friday (compared to Thursday):
$124-95=29$
The number of visitors increased by 29.

Saturday (compared to Friday):
$151-124=27$
The number of visitors increased by 27.

From the calculations, we can see that the number of visitors on Friday ($124$) was exactly 29 more than on Thursday ($95$).