Gold is 19 times as heavy as water and copper is 9 times as heavy as water.
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 12 times as heavy as water?
Answer/Solution
3:7
Steps/Work
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 * 12W
19+9x = 12(x+1)
x = 7/3
Ratio of gold with copper = 1:7/3 = 3:7
Answer is B
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 * 12W
19+9x = 12(x+1)
x = 7/3
Ratio of gold with copper = 1:7/3 = 3:7
Answer is B