If a note book costs Rs p and a pencil costs Rs 3, then the total cost (in Rs) of two note books and one pencil.
2p + 3
Step 1: Understand the prices
( ext{Price of 1 notebook} = p) rupees
( ext{Price of 1 pencil} = 3) rupees
Step 2: Cost of two notebooks
( ext{Cost of 2 notebooks} = p + p)
(= 2p)
Step 3: Add the pencil cost
( ext{Total cost} = ext{(cost of 2 notebooks)} + ext{(cost of 1 pencil)})
(= 2p + 3)
Answer: The total cost is (oxed{2p + 3}) rupees.