Sumon buys a pen and a pencil for Tk. 55. If the pen costs Tk. 25 more than the pencil, how much does the pencil cost?
A
10
B
15
C
17.5
D
20
Correct Answer: 15
Let, cost of pencil be x. So, cost of pen = x + 25 x + x + 25 = 55 2x = 30 x = 15