Cost of 36 pens and 42 pencils is Rs.460/-. What is the cost of 18 pens and 21 pencils?
Cost of 36 pens and 42 pencils = 460
Dividing by 2, we get :
=> cost of 18 pens and 21 pencils = $$\frac{460}{2}$$ = Rs. 230
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