Question

An alloy of copper and bronze weight 50g. It contains 80% Copper. How much copper should be added to the alloy so that percentage of copper is increased to 90%?
A) 45 gm
B) 50 gm
C) 55 gm
D) 60 gm

Answer 1

An alloy of copper and bronze weight 50g. It contains 80% Copper. How much copper should be added to the alloy so that percentage of copper is increased to 90%?
A) 45 gm
B) 50 gm✔
C) 55 gm
D) 60 gm


ĀNSWĒR ⏬⏬


B.50gm


THANKS ✌✌


# NAVI ❤ HARYANVI ♠

Answer 2

An alloy of copper and bronze weight 50g. It contains 80% Copper. How much copper should be added to the alloy so that percentage of copper is increased to 90%?

A) 45 gm
B) 50 gm
C) 55 gm
D) 60 gm

Answer  

B) 50 gm 



✔Initial quantity of copper =80/100 x 50 = 40 g 

And that of Bronze = 50 - 40 = 10 g

Let 'X' gm of copper is added to the mixture

=> (50 + X) x 90100 = 40 + X

=> 45 + 0.9X = 40 + X

=> X = 50 g

Hence, 50 gms of copper is added to the mixture, so that the copper is increased to 90%.
THANKS ✌☺


#DÊSÎ ♥