to make 12 flapjacks we need ingredients oats :180g sugar:120g butter: 60g syrup:40g.

Question

total weight of flapjack mixture is kg work out how much of each ingredient has been used. how many flapjacks can be made?

work out the ratio of oats to sugar and the ratio of oats to butter

work out the ingredients needed to make 18 flapjacks.using 120g  of butter, work out the amount needed for each of the other ingredients.

Answer 1

The ratios are: oats:sugar:butter:syrup=9:6:3:4, by dividing the numbers by 20.

So, oats:sugar=9:6=3:2; oats:butter: 9:3=3:1.

12 flapjacks weigh 180+120+60+80=440g=0.44kg, one flapjack weighs 440/12=110/3=36⅔g.

18 flapjacks weigh 440(18/12)=440(3/2)=660g=0.66kg and use 1½ times each ingredient used to make 12 flapjacks: oats: 270g; sugar: 180g; butter: 90g; syrup: 120g.

60g of butter was used to make 12 flapjacks, so twice as much butter will make twice as many flapjacks (24), and the ingredients are: oats: 360g; sugar: 240g; butter: 120g; syrup: 160g. 24 flapjacks weigh 880g=0.88kg.