You are given a math word problem and you are supposed to only use subtraction on the numbers embedded in the text to answer the following question and then only report the final numerical answer.

Context: They decided to hold the party in their backyard. They have 4 sets of tables and each set has 3 chairs. If a total of 14 people will attend the party 

 Question: How many more chairs will they have to buy?
2

Context: Baker made 43 cakes and 114 pastries. If he sold 154 pastries and 78 cakes 

 Question: How many more pastries than cakes did baker sell?
76

Context: In a school there are 868 girls and the rest are boys. If there are 281 more girls than boys 

 Question: How many pupils are there in that school?

1455