Two sisters, Elizabeth and Margareth, bought beads. Elizabeth bought 1 pack of red and 2 packs of clear beads, while Margareth bought 3 packs of blue and 4 packs of red beads. How many more beads do one sister have than the other, if each pack of beads contains 20 pieces of beads?
Elizabeth bought 1 + 2 = 
<gadget id="calculator">1+2</gadget>
<output>3</output>
3 packs.
So Elizabeth bought 3 x 20 = 
<gadget id="calculator">3*20</gadget>
<output>60</output>
60 pieces of beads.
Margareth bought 3 + 4 = 
<gadget id="calculator">3+4</gadget>
<output>7</output>
7 packs.
So Margareth bought 7 x 20 = 
<gadget id="calculator">7*20</gadget>
<output>140</output>
140 pieces of beads.
Therefore, Margareth bought 140 - 60 = 
<gadget id="calculator">140-60</gadget>
<output>80</output>
80 more beads than Elizabeth.

<result>80</result>