Q1) Colin begins with a whole bag of flour, then subtract 1/3 of it for the cake and 1/2 of it for the loaf. So he is left with:

What is the lowest common denominator?

Q2) You were able to correctly calculate:

So, I assume you know how to add and subtract fractions with different denominators.

For the second part of this question, we need to find what portion remains for Lee and Mary.

Mary ate 1/3 of her packet, leaving her with .

Lee ate 3/4 of his packet, leaving him with .

If Lee gives his remnant to Mary, we find what portion of a packet she has by adding the two remnants. Can you finish?

Q3) Let C represent the fraction of the votes Cathy got. We then require:

Once you find C, you may compare the 3 fractions directly by writing them with the same denominator.

Q4) Let F represent the fraction of the students in years 12 and 13. We then require:

Q5) Let T represent the fraction of toffees, and since there is the same fraction of mints as toffees, we may state:

Now solve for T.

Give these problems a try now, and if you get stuck, we will be glad to assist.