Question
If two LED TVs and one mobile phone cost ₹31,000,
while two mobile phones and one LED TV cost ₹35,000, then the value of one mobile phone is:Solution
ATQ, Let one mobile phone cost = Rs.x One LED TV cost = Rs. y According to the question 2x + y = 31,000 ...........(1) 2y + x = 35,000.............(2) Multiply eq (2) by 2, we get, 4y + 2x = 70,000 Now subtracting the above equation from eq (1), we get 4y + 2x - 2x - y = 70,000 - 31,000 3y = 39,000 y = 13,000 Hence, The cost price of one LED TV is RS 13,000
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