Amy bakes muffins for her friends. On Monday, she brings 1 muffin to school to share. Each day for the rest of the week she brings one more muffin to school than she did the day before. If on Saturday she counts that there are 7 muffins left, how many did she originally bake?
On Tuesday, she brings in 1 + 1 = 
<gadget id="calculator">1+1</gadget>
<output>2</output>
2 muffins.
On Wednesday, she brings in 2 + 1 = 
<gadget id="calculator">2+1</gadget>
<output>3</output>
3 muffins.
On Thursday, she brings in 3 + 1 = 
<gadget id="calculator">3+1</gadget>
<output>4</output>
4 muffins.
On Friday, she brings in 4 + 1 = 
<gadget id="calculator">4+1</gadget>
<output>5</output>
5 muffins.
In total, she brought 1 + 2 + 3 +4 + 5 = 
<gadget id="calculator">1+2+3+4+5</gadget>
<output>15</output>
15 muffins to school to share with her friends.
She baked a total of 15 + 7 = 
<gadget id="calculator">15+7</gadget>
<output>22</output>
22 muffins.

<result>22</result>