7 audio cassettes and 3 video cassettes cost Rs 1395, while 5 audio
cassettes and 4 video cassettes cost Rs 1665. Find the cost of an audio
cassette and that of a video cassette.
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Answer:
cost of an audio cassette = Rs. 45
Cost of a video cassette = Rs. 360
Step-by-step explanation:
if 1 audio cassette = a and 1 video cassette = v,
(1) 7a + 3v = 1395
(2)5a + 4v = 1665
(2)×3 ; 15a + 12v = 4 995
(1) ×4; 28a + 12v = 5 580
(28a + 12v) - (15a + 12v) = 5 580 - 4 995
13a = 585
a = 45
Substitute for (2);
5a + 4v =1665
5×45 +4v = 1665
4v = 1 440
v= 360
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