Explanation:
a) To find out how much flour Hafida needs, we first need to calculate the amount of sugar needed for 60 biscuits. Since she needs 40g of sugar for 12 biscuits, she will need:
40g sugar / 12 biscuits x 60 biscuits = 200g sugar
Now, we know that Hafida needs three times as much flour as sugar. So, she will need:
200g sugar x 3 = 600g flour
Therefore, Hafida needs 600g of flour to make 60 biscuits.
b) (i) Hafida needs two times as much butter as sugar, and we already know that she needs 200g of sugar. So, she will need:
200g sugar x 2 = 400g butter
(ii) Hafida needs 400g of butter, and she can buy butter in 150g packs. To find out how many packs she needs to buy, we can divide the total amount of butter needed by the amount of butter in each pack:
400g butter / 150g per pack ≈ 2.67 packs
Since she cannot buy a fraction of a pack, Hafida will need to buy 3 packs of butter.
Therefore, Hafida needs 400g of butter and she will have to buy 3 packs of butter.