Let’s assume the cost of an audio cassette and that of a video cassette be ₹a and ₹b, respectively. Then forming equations according to the question, we have
…(a)
… (b)
On multiplying equation (a) and equation (b)bb3,
We get,
…(c)
…(d)
Subtracting equation (iv) from equation (c),
⇒a
On substituting in equation (a)
⇒b
Therefore, it’s found that the cost of one audio cassette
And the cost of one video cassette