A lump of two metals weighing 18 g is worth Rs. 87 but if their weight is interchanged, it would be worth Rs. 78.60. If the price of one metal be Rs. 6.70 per gram, find the weight of the other metal in the mixture.  Select:	A) 8g	B) 12g	C) 15g	D) 18g	E) None
Solution: Cost of (18 g of 1st metal + 18 g of 2nd metal) = Rs. 165.60   Cost of (1 g of 1st metal + 1 g metal of 2nd metal) = Rs. 9.20   Hence cost of 1 g of 2nd metal,   = 9.20 - 6.70   = Rs. 2.5   Mean price = Rs. 87/18   quantity of 1st metal /quantity of 2nd metal = 14/6:56/30 = 5:4   Quantity of 2nd metal = (18*4)/9= 
<gadget id="calculator">(18*4)/9</gadget>
<output>8</output>
8 g.   8gnswer: Option 8g
<result>A</result>
A lump of two metals weighing 18 g is worth Rs. 87 but if their weight is interchanged, it would be worth Rs. 78.60. If the price of one metal be Rs. 6.70 per gram, find the weight of the other metal in the mixture.