16. A mass of copper and brass weighs 24 kg and is worth Rs. 30.50. If the proportion of copper and brass be interchanged the mass would be worth Rs. 35.50. If 2 kg of copper and 3 kg of brass cost Rs. 6.75, find the cost of copper per kg ?

• 1.5 rs
  let x be mass of copper
  let y be mass of brass
  x+y=24
  let c1 be cost of copper;
  c2 be cost of brass
  xc1+yc2=30.50
  xc2+yc1=35.50
  By adding these two
  c1(x+y)+c2(x+y)=66
  24c1+24c2=66
  by simpling
  4c1+4c2=11
  and given
  2c1+3c2=6.75
  multiplying by 2
  4c1+6c2=13.5
  4c1+4c2=11
  by substracting
  c2=1.25
  & c1=1.5
• 11 years agoHelpfull: Yes(75) No(0)
• 
  2c+3b=6.75
  
  xc+b(24-x)=30.50
  put x=2
  2c+22b=30.05
  
  19b=23.3
  b=(23.3/19)
  c=(6.75-(23.3/19))/2
  c=2.76
• 11 years agoHelpfull: Yes(1) No(12)