A backpack and books together weighs 60kg. If the books weigh 56kg, what is the weight of the backpack?

2. The desks in a school are arranged In 6 rows with 12 desks in each row. If the desks are
rearranged in rows of 8 desks, how many rows will there be?

3. A hall has 14 rows of chairs with 16 chairs in each row. If there are 175 people in the hall,
how many empty chairs are there?

4. In an examination, David's total marks in three subjects was 125. In one subject his mark
was 45 and in the other two subjects, his marks were the same What was his mark in each of
these two subjects?

5. Paul is 10 years old. His father is twice his age. His grandfather is 3 times older than his
father. How old is Paul's grandfather?
6 Find the total cost of 3 books at $5.50 each and 4 pens at $1.75 each.
Mother bought 8

i need help with 2,and u can comment number 3,4,5 working