Question

7 audio cassettes and 3 video cassettes rs. 1110,while 5 audio cassettes and 4 video cassettes cost rs. 1350 .find the cost of one audio and video​

Answer 1

Answer:

1 Audio = 30

1 Video = 300

Step-by-step explanation:

7 audio + 3 video = 1110

5 audio + 4 video = 1350

On solving 13 audio = 390

1 Audio = 30

1 Video = 300

Answer 2

Let the audio cassetts be x

And video cassetts be y

ACTQ

cond 1

7x + 3y = 1110. _______(1)

Cond 2

5x + 4y = 1350 _______(2)

By elemenation method

7x + 3y = 1110 (×5)

5x + 4y = 1350 (× 7)

35x + 15y = 5550

35x + 28y = 9450

______________

0. + -13y = -3900

________________

-13 y = -3900

y = -3900/-13

y= 300

i.e 300 video casetts

And...

7x + 3 (300) =1110 ( subsituting value)

7x+900=1110

7x =1110-900

7x=210

x= 210/7

x=30

i.e 30 audio casetts

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