Priya needs 13⅓ cups of orange juice 
 
Diego 15 cups 
 
Step-by-step explanation: 
 
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Priya 
 
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Cup of water = 2½ 
 
Cup of orange = ⅓ 
 
If 2½ cups of water requires ½ cup of orange juice concentrate 
 
Then 100 cups of water would require x cup of orange 
 
Representing the above statement mathematically 
 
2½ : ⅓ = 100 : x 
 
5/2 : 1/3 = 100 : x ------------------Convert ratio sign to division 
 
5/2 ÷⅓ = 100/x 
 
5/2 * 3 = 100/x 
 
15/2 = 100/x ---------------Multiply both sides by x 
 
15/2 * x = 100/x * x 
 
15x/2 = 100 ------------------ Multiply both sides by 2 
 
2 * 15x/2 = 2 * 100 
 
15x = 200 --------------- Divide both sides by 15 
 
x = 200/15 
 
x = 13⅓ 
 
So, 13⅓ cups of orange is needed by Priya 
 
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Diego 
 
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Cup of water = 1⅔ 
 
Cup of orange = ¼ 
 
If 1⅔ cups of water requires ¼ cup of orange juice concentrate 
 
Then 100 cups of water would require x cup of orange 
 
Representing the above statement mathematically 
 
1⅔:¼ = 100:x 
 
5/3 : ¼ = 100:x 
 
5/3 ÷¼ = 100 ÷ x 
 
5/3 * 4/1 = 100 ÷ x 
 
20/3 =100/x----------------------- Multiply x to both sides 
 
20/3 * x = 100/x * x 
 
20x/3 = 100 ------------------------ Multiply 3 to sides by 3 
 
3 * 20x/3 = 100 * 3 
 
20x = 300 ------------- Divide both sides by 2 
 
20x/20 = 300/20 
 
x = 15 
 
So, 15 cups of orange is needed by Diego