The cost of four dozen accounting machine ribbons and six dozen proof machine ribbons was Rs. 188/-. If two dozen proof machine ribbons cost Rs. 36/-, what is the cost of 3 dozen accounting machine ribbons?
A)Rs. 45 B)Rs. 72 C)Rs. 54 D)Rs. 60

• Ans is (D)
  since, 2 dozen proof ribbons cost rs 36, so 1 dozen will cost to rs 18, and so cost of six dozen proof ribbons= `18*6=108, and hence, 4 dozen accounting machine ribbons will be 188-108=rs 80. so 1 dozen accnting ribbons = 80/4=rs20, so 3dozen acc. ribbons = 3*20= 60
• 4 years agoHelpfull: Yes(2) No(0)
• ans is : c
• 4 years agoHelpfull: Yes(0) No(4)