Nails and screws are manufactured at a uniform weight per nail and a uniform weight per screw. If the total weight of one screw and one nail is half that of 6 screws and one nail, then the total weight of 3 screws, and 3 nails is how many times that of 1.5 screws and 4.5 nails? Select.
A) a. 4 B) b. 5/2 C) c. 2 D) d. 3/2 E) e. 20/11
let the weight of nail be n and that of screw be s..   so s+w=1/2 * (6s+1n)...   or 1n = 4s..   lets see the weight of 3 s and 3n= 3s+3*4s=15s..   and weight of 1.5s and 4.5n3 +3*4= 
<gadget id="calculator">3 +3*4</gadget>
<output>15</output>
15s..   and weight of 1.5s and 4.5n= 1.5s+4.5*1.5s=8.25s..   ratio1.5 +4.5*1.5= 
<gadget id="calculator">1.5 +4.5*1.5</gadget>
<output>8.25</output>
8.25s..   ratio= 15s/8.25s=15/8.25=20/11   e. 20/11
<result>E</result>
Nails and screws are manufactured at a uniform weight per nail and a uniform weight per screw. If the total weight of one screw and one nail is half that of 6 screws and one nail, then the total weight of 3 screws, and 3 nails is how many times that of 1.5 screws and 4.5 nails?