The recipe makes 8 pancakes.
He wants to make 12 pancakes.
First, find out how many times what he needs is compared to the recipe.
He wants 12 pancakes; the recipe makes 8 pancakes.
12/8 = 1.5
He wants to make 1.5 times the recipe.
Now multiply every ingredient amount by 1.5 to find what he needs to make 12 pancakes.
240 g of plain flour.
240 g * 1.5 = 360 g of plain flour
2 egs
2 eggs * 1.5 = 3 eggs
600 ml milk
600 ml * 1.5 = 900 ml
Answer: 360; 3; 900