Q. The cost of 4 CD(s) is 4 more than the cost of a DVD. The cost of 1 CD(s) and a DVD is 10. What is the cost of a DVD?

• cost of CD =c and cost of DVD = d
  so 4c = d+4 or 4c - d = 4-----(I)
  c + d = 10 -----------------(II)
  by solving the above two equation..
  so 5c = 14
  c= 14/5
  cost of CD=2.80Rs
  so d= 10 - 14/5
  cost of DVD = 36/5 = 7.20Rs ANSWER
• 11 years agoHelpfull: Yes(6) No(1)
• 4C=D+4
  4C-D=4
  C+D=10
  solving equation, cost of dvd=7.2
• 11 years agoHelpfull: Yes(2) No(1)
• 4c-d=4 eq(1)
  c+d=10 eq(2)
  eq(1)+eq(2) we get,
  c=2.8,hence 2.8+d=10,or d=7.20(ans)
  
• 10 years agoHelpfull: Yes(1) No(2)
• 4c-d=4 eq(1)
  c+d=10 eq(2)
  eq(1)+eq(2) we get,
  c=2.8,hence 2.8+d=10,or d=7.20(ans)
• 11 years agoHelpfull: Yes(0) No(0)
• cost of a dvd x
  cost of 4 cd(s) x+4
  then cost of a cd 1/4(x+4)
  1dvd+1cd=10
  x+[1/4(x+4)]=10
  4x+x+4=4*10
  5x=36
  x=7.20
  cost of dvd=rs 7.20
• 11 years agoHelpfull: Yes(0) No(0)