3 pounds of 05 grass seed contain 1 percent herbicide. a different type of grass seed, 20, which contains 20 percent herbicide, will be mixed with 3 pounds of 05 grass seed. how much grass seed of type 20 should be added to the 3 pounds of 05 grass seed so that the mixture contains 15 percent herbicide?  Choose the correct choice from the following answers:
A) 3 B) 3.75 C) 4.5 D) 8.4 E) 9
<gadget id="calculator">15 * 3</gadget>
<output>45</output>

<gadget id="calculator">45 - 3</gadget>
<output>42</output>

<gadget id="calculator">20 - 15</gadget>
<output>5</output>

<gadget id="calculator">42 / 5</gadget>
<output>42/5 = around 8.4</output>

<result>D</result>
3 pounds of 05 grass seed contain 1 percent herbicide. a different type of grass seed, 20, which contains 20 percent herbicide, will be mixed with 3 pounds of 05 grass seed. how much grass seed of type 20 should be added to the 3 pounds of 05 grass seed so that the mixture contains 15 percent herbicide?
divide(subtract(multiply(15, 3), 3), subtract(20, 15))
05 grass seed contains 5 % herbicide and its amount is 3 pound 20 grass seed contains 20 % herbicide and its amount is x when these two types of grass seeds are mixed , their average becomes 15 % thus we have 3 ( 1 ) + x ( 20 ) / ( x + 3 ) = 15 3 + 20 x = 15 x + 45 5 x = 42 or x = 8.4 d