There are 10 quarts of tea left from the party. Four students each drank 1.5 quarts of tea and 16 students each drank 2 quarts of tea. How many gallons of tea were at the beginning of the party?
4 students drank 1.5 quarts = 4 * 1.5 = 
<gadget id="calculator">4*1.5</gadget>
<output>6</output>
6 quarts
16 students drank 2 quarts = 16 * 2 = 
<gadget id="calculator">16*2</gadget>
<output>32</output>
32 quarts.
Students drank 6 + 32 quarts = 
<gadget id="calculator">6+32</gadget>
<output>38</output>
38 quarts.
Students + tea left = 38 + 10 quarts = 
<gadget id="calculator">38+10</gadget>
<output>48</output>
48 quarts
48 quarts = 12 gallons.
The party started with 12 gallons of tea.

<result>12</result>