Gold is 19 times as heavy as water and copper is 9 times as heavy as water. In what ratio should these be mixed to get an alloy 13 times as heavy as water? Choices.
A) 1:2
B) 2:3
C) 4:1
D) 5:2
E) 6:5
G = 19W   C = 9W   Let 1gm of gold mixed with x gm of copper to get 1+x gm of the alloy   1gm gold + x gm copper = x+1 gm of alloy   19W+9Wx = x+1 * 13W   19+9x = 13(x+1)   x = 3/2   Ratio of gold with copper = 1:3/2 = 2:3   Answer is 2:3
<result>B</result>
Gold is 19 times as heavy as water and copper is 9 times as heavy as water. In what ratio should these be mixed to get an alloy 13 times as heavy as water?