bc, you want to make 18 and the amount of each ingredients there can only make twelve you see how much out of the eighteen is left when you make twelve: 18-12=6. Half of six is twelve so you use half of each amount of ingredients to make your six flapjacks. So you would add the amount of ingredients to make 12 with the amount of ingredients to make six. You probably won't understand bc of how I explain it so here is the first one.
140 g margarine = 12 flapjacks
140 ÷ 2 or 1/2 = 70
70 g margarine 6 flapjacks
140 + 70 = 210
So you would use 210 g margarine to make 18 flapjacks.
The answers for each are at the top, I just only explain the margarine. Hope it helps. Use the formula that i use to see the working out for the rest of them. Leave a comment if you need me to explain more or the rest of them
