Eliza can iron a blouse in 15 minutes and a dress in 20 minutes.  If she spends 2 hours ironing blouses and 3 hours ironing dresses, how many pieces of clothes did she iron?
Since 60 minutes equal 1 hour, in 2 hours, Eliza ironed blouses for 2 x 60 = 
<gadget id="calculator">2*60</gadget>
<output>120</output>
120 minutes.
Eliza can iron 120 / 15 = 
<gadget id="calculator">120/15</gadget>
<output>8</output>
8 blouses.
Since 60 minutes equal 1 hour, in 3 hours, Eliza ironed dresses for 3 x 60 = 
<gadget id="calculator">3*60</gadget>
<output>180</output>
180 minutes.
Eliza can iron 180 / 20 = 
<gadget id="calculator">180/20</gadget>
<output>9</output>
9 dresses.
In total, Eliza ironed 8 + 9 = 
<gadget id="calculator">8+9</gadget>
<output>17</output>
17 pieces of clothes.

<result>17</result>