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Three markers and one pen cost Rs. 245. Three markers and three pens cost Rs. 345. What is the price of one marker?
  1. Rs. 55
  2. Rs. 60
  3. Rs. 65
  4. Rs. 70
Explanation

Let marker = M and pen = P.

Equation 1:
 3M + P = 245

Equation 2:
3M + 3P = 345

Subtract Equation 1 from Equation 2:

3P − P = 345 − 245
2P = 100
P = 50

Now:

3M + 50 = 245
3M = 195
M = 65

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