The price of 3 pens and 6 pencils is Rs. 1500. With the same money one can buy 1 pen and 12 pencils. If one wants to buy 23 pencils, how much shall he have to pay ? Choose the correct choice from the following choices.
A) 2400  B) 2300  C) 2200  D) 2100  E) 2000
Let the price of a pen and a pencil be Rs. x and Rs. y respectively.   Then, 3x + 6y = 1500 .... (i)   and x + 12y = 1500 .... (ii)   Divide equation (i) by 3, we get the below equation.   = x + 2y = 500. --- (iii)   Now subtract (iii) from (ii)   x + 12y = 1500 (-)   x + 2y = 500   ----------------   10y = 1000   ----------------   y = 100   cost of 23 pencils = 23*100= 
<gadget id="calculator">23*100</gadget>
<output>2_300</output>
2300   Answer : 2300
<result>B</result>
The price of 3 pens and 6 pencils is Rs. 1500. With the same money one can buy 1 pen and 12 pencils. If one wants to buy 23 pencils, how much shall he have to pay ?