To bake $100$ of his favorite cookies, Mr. Wallis needs $350$ grams of sugar.  

1. How many grams of sugar would he need to bake $10$ cookies?  What about $20$ cookies?  Show all work.

   Hint (a):

   You can use a proportion to solve this problem. Once you find the amount of sugar necessary for $10$ cookies, simply multiply by $2$ to find the amount necessary for $20$ cookies. 

2. What is the unit rate?  That is, how many grams of sugar are needed for $1$ cookie?

   Hint (b):

   Notice that it takes $35$ grams of sugar to create $10$ cookies. Divide $35$ by $10$ to get the unit rate.

   Answer (b):

   Unit rate: $3.5$ grams of sugar per cookie

3. To help him know how much sugar to use when baking cookies, Mr. Wallis started to make a table, as shown below.  Copy and complete his table on your paper.

   Hint (c):

   Proportions, again, will be very useful. A sample proportion is provided below.
   $\frac{100\text{ cookies}}{350\text{ grams}}=\frac{2\text{ cookies}}{x\text{ grams}}$
   $x=7$