This list shows the ingredients needed to make 12 flapjacks.
250g oats
120g butter
120g brown sugar
2 tablespoons syrup
How much of each ingredient would be needed to make 18 flapjacks?
goats
g butter
g sugar
tablespoons syrup

Both 12 and 18 can be divided by 6. Therefore, convert 12 flapjacks into 6 flapjacks so you can use this for the final answer. Divide all the ingredients by 2= 250/2, 120/2, 120/2, 2/2 which will give you the ingredients for 6 flapjacks. After you have found the ingredients for 6 flapjacks, multiply each by 3 because 6x3=18. You should have your answer.

20000 as first it increases by 2500 then by 5000 so next it will increase by 10000