a manufacturing company has 15% cobalt ,25% led and 60% of copper. if 5kg of led is used in a mixture how much copper we need to use	Choices.
A) 12 kg B) 13 kg C) 22 kg D) 14 kg E) 15 kg
25%=5kg   100%=20kg   60% of 20 kg= 12kg   12 kg   12 kgNSWER:12 kg
<result>A</result>
a manufacturing company has 15% cobalt ,25% led and 60% of copper. if 5kg of led is used in a mixture how much copper we need to use