railway RPF SI Mock Test Series 2024 Quantitative Aptitude Algebra Linear Equation in 1 Variable

X bought 40 pencils for a total of Rs. 180 and bought 2 dozens of pens for Rs. 180. Find the difference between the price of one pen and one pencil. 

1
Rs. 3.5
2
Rs. 3
3
Rs. 2
4
Rs. 2.5
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