Question 252163
A SHOPKEEPER HAS THREE TYPES OF BLACK PULSE COSTING RS.60, RS.72 AND RS.90 PER KG RESPECTIVELY.
THE FIRST TWO TYPES OF PULSE ARE MIXED IN THE RATION OF 2:3.
lET THE THIRD TYPE PULSE BE MIXED IN THE RATIO x
THE FINAL COST OF THE MIXTURE IS RS.78 PER KG
THEREFORE, WE GET
   (2X60)+(3X72)+90x = (2+3+x)X78
    120+216+90x = (5+x)X 78
    336+90x     = 390+78x
    90x-78x     = 390-336
         12x    = 54
           x    = 54/12
           x    = 9/2