Muffins:
1/4 tsp salt
1/4 oats
1 cup milk
1/2 sugar
2 cups flour
makes 8 muffins
Maryse wants to make 20 muffins. What does she need to do to achieve that?
Solution
20 muffins = 8 + 8 + 4
(8 + 8 + 4 means that Maryse will need twice the original amount + half the original amount)
Another way to see it is that this amount is equal to 2.5 times the original amount the recipe is asking for.
20 / 8 = 2.5
Old amount
1/4 tsp salt
1/4 oats
1 cup milk
1/2 sugar
2 cups flour
Things to keep in mind.
Half of 1/4 is 1/8
Half of 1/2 is 1/4
Half of 1 is 1/2
Half of 2 is 1
New amount.
1/4 + 1/4 + 1/8 tsp salt
1/4 + 1/4 + 1/8 oats
1 + 1 + 1/2 cup milk
1/2 + 1/2 + 1/4 sugar
2 + 2 + 1 cups of flour