A recipe for 3 pancake requires 2/3 cup sugar and ¾ cup milk. How many cups of sugar and milk needed to make 2 pancakes?
Solution:
By ratio and proportion:
3 pancakes : 2/3 cup sugar : ¾ cup milk = 2 pancakes : x cup sugar : y cup milk
for;
3 pancakes : 2/3 cup sugar and 2 pancakes : x cup sugar
solve for x cup sugar;
3 : 2/3 = 2 : x
3x = 4/3
x = 4/9 cup sugar
for;
3 pancakes : ¾ cup milk and 2 pancakes : y cup milk
solve for y cup milk
3 : 3/4 = 2 : y
3y = 6/4
y = ½ cup milk
therefore;
4/9 cup sugar and ½ cup milk need to make 2 pancakes (answer)