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Shivam Bhagat Grade: 9
        

gold is 19 times as heavy as water, and copper is 9 times as heavy as water. in what ratio should cu and au should be mixed so that the alloy is 15 times heavy as water.


 

6 years ago

Answers : (1)

AKASH GOYAL AskiitiansExpert-IITD
419 Points
										

Dear Shivam


let gold quantity be a and copper be b


then S= (aSg + bSc)/(a+b)


15=19a+9b/a+b


divide numerator and denominator by b and take a/b=x


15=19x+9/x+1


19x+9=15x+15


4x=6


x=3/2


gold/copper = 3/2


 


All the best.                                                           


AKASH GOYAL


AskiitiansExpert-IIT Delhi


 


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6 years ago
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