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If two mixers and one T.V cost Rs. 700. While two T.V s and one mixer cost Rs. 980. The value of one T.V is:
Question

If two mixers and one T.V cost Rs. 700. While two T.V s and one mixer cost Rs. 980. The value of one T.V is:

A.

Rs.480

B.

Rs.420

C.

Rs.400

D.

Rs.450

Correct option is B

Given:
The cost of two mixers and one TV is Rs. 700.
The cost of two TVs and one mixer is Rs. 980
Solution:  
Let the Cost of one mixer be M, and  Cost of one TV be T.
Cost of 2M  +  1T = 700 --- (I)
And cost of 2T + 1M  = 980 --- (II)
Add both the equation
3M + 3T = 1680
1M + 1T = 560 --- (III)
Subtract eq II and eq III
1T = 420 
Thus, the Cost price of 1 TV is Rs. 420

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