Money order would be the answer! Hope this helps you.
        
                    
             
        
        
        
The answer would be 20 books
4x5=20
        
                    
             
        
        
        
Answer:
1) Word Problem 
Sally has $2 and her mother gave her $10 to buy something from the store. Sally spent $7 at the store. How much money does Sally have now?
Expression
(2 + 10) - 7
2) Word Problem
Bob has 5 friends and each of them gave Bob 2 cookies. Bob originally had 2 of his own cookies. After collecting all of the cookies Bob split them evenly among him and his friends. How many cookies does each person have?
Expression
(5 x 2 + 2) ÷ 6
 
        
             
        
        
        
So tis is a ratio  16 is to 3 or 16:3
if use 64 tea bags then how many cups of sugar so 
turn 16:3 into fraction 
16:3=16/3 or 3/16, it doesn't matter
then you want to find 64:x or 64/x or x/64
we know that 16/3=64/x because it tis an equivalent ratio
so 16/3=64/x
multiply both sdies by (3 times x)
16 times x times 3/3=64 times 3 times x/x
16 times x=64 times 3
16x=192
divide both sdies by 16
x=12
theanswer is 12 cups of sugar