The average weight of 10 bags of sand is 20 pounds. Another bag of sand is added to the group and decreases the average weight by 1 pound. How much does the new bag of sand weigh? Select the correct option.
A) 7	B) 21	C) 29	D) 9	E) 19
Total weight of 10 bags of sand = 10*20= 
<gadget id="calculator">10*20</gadget>
<output>200</output>
200   Total weight of 11 bags of sand= 11*19= 
<gadget id="calculator">11*19</gadget>
<output>209</output>
209   Weight of new bag= 209-200= 
<gadget id="calculator">209-200</gadget>
<output>9</output>
9 pounds   Answer is 9
<result>D</result>
The average weight of 10 bags of sand is 20 pounds. Another bag of sand is added to the group and decreases the average weight by 1 pound. How much does the new bag of sand weigh?