A school recently had their Silver jubilee. As part of the celebration, they decided to gift all its students 11 boxes of erasers. Each box contained 47 erasers, and there were 1724 students in the school. But they found that they had only 882406 erasers. How many additional erasers do they need to buy so that each student can get the specified number of gifts.

1136 people visited the Open Bazaar on the day it opened. On the second and third day, the number of visitors increased by 564 as compared to the previous day. On the fourth day, 1473 more visitors came as compared to the third day. And on the fifth day, the number of people who came were double the number who came on the fourth day. How many people, in total, visited the Open Bazaar?

In an exam of English and General Knowledge, 32% and 26% students failed in English and General Knowledge respectively. If 20% students failed both in English and General Knowledge, find the percentage of students who passed in both the exams.