Question

5 pencil and 4 erasers cost as much as 3 pencil and 7 erasers. what is the ratio of cost of 1 pencil to 1 eraser​

Answer 1

5x + 4y = 3x + 7y
5x - 3x = 7y - 4y
2x = 3y
Cost of one pencil to one eraser is 2 : 3.


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Answer 2

From the given question the correct answer is:

the ratio of cost of one pencil to one eraser is 2 : 3.

Let x be the cost of pencil

and y be the cost of the rubber

So,we can say that

5x + 4y = 3x + 7y

5x - 3x = 7y - 4y

2x = 3y

From this, we can take the ratio of cost of 1 pencil to 1 eraser​

that is 2 : 3.