Nine exercise books cost £3.15.
a Work out the cost of 11 exercise books.
x/11 = 3.15/9
To work out the cost of 11 exercise books, we can set up a ratio using the given information:
9 exercise books cost £3.15.
Let's calculate the cost per exercise book:
£3.15 ÷ 9 = £0.35
We know that the cost of 9 exercise books is £3.15, so we can use this information to find the cost of 1 exercise book.
Now, let's calculate the cost of 11 exercise books:
£0.35 × 11 = £3.85
Therefore, the cost of 11 exercise books is £3.85.
To work out the cost of 11 exercise books, you first need to find the cost of one exercise book.
To do this, you can divide the total cost (£3.15) by the number of exercise books (9):
£3.15 ÷ 9 = £0.35
So each exercise book costs £0.35.
Now that you know the cost of one exercise book, you can find the cost of 11 exercise books by multiplying the cost of one exercise book (£0.35) by the number of exercise books (11):
£0.35 × 11 = £3.85
Therefore, the cost of 11 exercise books is £3.85.