Question

Twin sisters Mary and Jane had of sugar to bake desserts for their birthday party. Mary
used of their sugar on cookies, on brownies, and on
cupcakes. Jane used of sugar on a cake and on whipped cream.
6.5 pounds
1 pound 2 ounces 22 ounces 1 pound 3 ounces
1.2 pounds 0.3 pounds
How much sugar do Mary and Jane have left after baking all their desserts to the nearest tenth of a
pound?

Answer 1

To determine how much sugar Mary and Jane have left after baking, we first need to find out how much sugar each sister used in total and then subtract that from the initial amount of sugar.

### Step 1: Convert everything to pounds
**Initial amount of sugar:**
- 6.5 pounds

**Mary's usage:**
- Cookies: 1 pound 2 ounces
- Brownies: 22 ounces
- Cupcakes: 1 pound 3 ounces

Let's convert everything to pounds:
1 pound 2 ounces = 1 + (2 / 16) = 1 + 0.125 = 1.125 pounds
22 ounces = 22 / 16 = 1.375 pounds
1 pound 3 ounces = 1 + (3 / 16) = 1 + 0.1875 = 1.1875 pounds

Now we can sum Mary’s total usage:
- Total for Mary = 1.125 pounds + 1.375 pounds + 1.1875 pounds = 3.6875 pounds

**Jane's usage:**
- Cake: 1.2 pounds
- Whipped cream: 0.3 pounds

Total for Jane = 1.2 pounds + 0.3 pounds = 1.5 pounds

### Step 2: Sum total usage
Now, we add Mary and Jane's total usage:
- Total usage = 3.6875 pounds + 1.5 pounds = 5.1875 pounds

### Step 3: Calculate remaining sugar
Now, we subtract the total usage from the initial amount of sugar:
- Remaining sugar = 6.5 pounds - 5.1875 pounds = 1.3125 pounds

### Step 4: Round to the nearest tenth
Rounding 1.3125 pounds to the nearest tenth gives us 1.3 pounds.

### Conclusion
Mary and Jane have **1.3 pounds of sugar left** after baking all their desserts.