Platinum is 19 times as heavy as bronze and silver is 9 times as heavy as bronze. In what ratio these two metals be mixed so that the alloy is 15 times as heavy as bronze is Answers.
A) 2:1 B) 3:2 C) 1:2 D) 2:3 E) 3:4
Let the proportion of weight of platinum in the mixture = x   then the proportion of weight of silver in the mixture = 1 - x   According to the question   19 X x + 9 (1 - x) = 15 X 1   19x + 9 - 9x = 15   10x = 15 - 9= 
<gadget id="calculator">15 - 9</gadget>
<output>6</output>
6   x= 6/10 = 3/5   Therefore the proportion of weight of platinum in the mixture = x = 3/5   and the proportion of weight of silver in the mixture = 1 - x = 1 - 3/5 = 2/5   The required ratio of platinum : silver = 3/5 : 2/5   = 3 : 2   ANSWER:3:2
<result>B</result>
Platinum is 19 times as heavy as bronze and silver is 9 times as heavy as bronze. In what ratio these two metals be mixed so that the alloy is 15 times as heavy as bronze is