The price of 10 chairs is equal to that of 4 tables. The price of 15 chairs and 2 tables together is Rs. 4000. The total price of 12 chairs and 3 tables is:

A. Rs. 3500
B. Rs. 3750
C. Rs. 3840
D. Rs. 3900

• Answer is D
  
  Let the cost of chairs be 'x' and tables be 'y'.
  10x=4y i.e., x=(2/5)y
  and given that 15x+2y=4000
  15((2/5)y)+2y=4000
  8y=4000 i.e., y=500 and x=200
  The total price of 12 chairs and 3 tables is: 12*(200)+3*500=2400+1500=3900
  
  
• 11 years agoHelpfull: Yes(7) No(2)
• 10 Chair = 4 Tab
  So, 5 Chair = 2 Tab
  or, 15 Chair = (4+2) = 6 Table
  Now, 15 Chair + 2 Table = 4000/-
  or, 6 Table + 2 Table = 8 Table = 4000/-
  so, 1 Table = 4000 /8 = 500/- So, 500 X 4 Table = 2000 = 10 Chair , 1Chair = 2000/10 = 200
  So, (12 X 200) + (3 X 500) = 3900 . Ans.
• 10 years agoHelpfull: Yes(4) No(2)
• D.
  10x=4y ie x= 4y/10
  15x+2y= 4000
  15* 4y/10+2y=4000
  6y+2y=4000
  y=4000/8=500
  x=4*500/10=200
  So 12x+3y=3900
• 9 years agoHelpfull: Yes(0) No(0)