Zinc and copper are melted together in the ratio 9 : 11. What is the weight of melted mixture, if 31.5 kg of zinc has been consumed in it?
Pick one:	A) 58 kg	B) 60 kg	C) 64 kg	D) 70 kg	E) None
Sol.   For 9 kg Zinc, mixture melted = (9+11) kg.   For 31.5 kg Zinc, mixture, melted = [20/9 x 31.5] kg   = 70 kg.   Answer 70 kg
<result>D</result>
Zinc and copper are melted together in the ratio 9 : 11. What is the weight of melted mixture, if 31.5 kg of zinc has been consumed in it?