5 a.c & 4 v.c together cost Rs.1110 & 6 a.c and 7 v.c cost Rs.1350. how much does 4 a.c and 6 v.c cost?

a.c means audio cassettes whereas v.c meas video cassettes


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5 a.c %26amp; 4 v.c together cost Rs.1110 %26amp; 6 a.c and 7 v.c cost Rs.1350. how much does 4 a.c and 6 v.c cost?
subtract 5ac%26amp;4vc from 6ac%26amp;7vc We get 240





6ac%26amp;7vc = 1350


5ac%26amp;4vc = 1110


................................


1ac%26amp;3vc = 240





Add 5ac%26amp;4vc (%26amp;) 6ac%26amp;7vc We get 11ac%26amp;11vc = 2460





Divide 11ax%26amp; 11 vc =2450 by 11 we get 224 (approximately)





Subtract 1ac%26amp;1vc = 224 from 1ac%26amp;3vc = 240 We get


2vc= 16 I.e 1vc=8





substitute value of vc in 1ac%26amp;1vc=224 we get ac = 216





so cost of 4ac%26amp; 6vc = 912 (approximately)
Reply:5 a.c%26amp; 4 v.c=1110,


6 a.c %26amp; 7 v.c=1350


4 a.c %26amp; 6 v.c=1230
Reply:5ac + 4vc = 1100





6ac + 7vc = 1350





Solve the two equations, get the cost of 1 ac and 1 vc separately. and then add the the two to get the answer needed!