The total price of 6 trousers and 5 shirts is Rs 2,340/-. The total price of 7 shirts is Rs 540 more than the total price of 3 trousers.What is the total price of 4 shirts ?

A) Rs 780/-
B) Rs 680/-

C) Rs 760/-
D) Rs 640/-

E) Rs 720/-

Correct answer:
E) Rs 720/-

Description for Correct answer:
Let the price of one trouserrs be Rs.x and

the price of one shirt be Rs.y

According to question,

5y + 6x = 2340 ---- (i)

7y - 3x = 540 --- (ii)

On multiplying equation (ii) by 2 and adding in eqution (i), we get

19y = 3420

y = 180

Please provide the error details in above question

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