160 kg of alloy of copper and aluminium contains 55 percent of aluminium.how much aluminium must be melted into it to make aluminium 70 percent.
2 answers
.55*160 + x = .70(160+x)
If one plane is flying at 40 mph while another is flying at 100 mph, and they are 200 miles apart and flying directly towards each other, how long will it take them to meet?
1 answer