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A trader buys x articles for a total cost of Rs 600. (i) Write down the cost of one article in terms of x. If the cost per article were Rs 5 more, the number of articles that can be bought for Rs 600 would be four less. (ii) Write down the equation in x for the above situation and solve it for x.

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According to ques,

Number of articles

   

And, the total cost of articles

   

Again,

(i) Cost of one article

   

(ii) also,

   

or,

   

or,

   

or,

   

or,

   

Since the number of articles cannot be negative,