Under Rs40,000 you can't buy a high end gaming laptop..But there are laptops which has .. decent laptops .. Like you can check Asus R558U .. it costs you areound 41K and has 7th gen intel i5 processor along with 4GB of DDR4 RAM .. and 2GB of Graphics card.. as well..
You can go for HP 15-ac122tu (N8M18PA) Laptop (Core i3 5th Gen/4 GB/1 TB/DOS) , It has the necessary power for everyday office work and for entertainment purpose. So if you are looking for a low budget laptop then this is the one worth considering. HP 15-ac122tu
you can have a look at Asus PRO P2420LA-WO0454D Laptop (Core i3 5th Gen/4 GB/1 TB/Windows 10) my cousin is using it it has 6 cell li-ion battery which keeps the show running for long hours,along with it is an affordable one and packs in good features such as great amount of storage capacity, good configuration, preloaded Windows OS .Asus PRO P2420LA-WO0454D Laptop (Core i3 5th Gen/4 GB/1 TB/Windows 10)
You can check Dell Vostro 15 3568 (Z553505UIN9) Laptop (Core i3 6th Gen/4 GB/1 TB/Ubuntu) It is a preferable option for for people looking for a decently powerful laptop that is capable of handling light to medium tasks smoothly. Dell Vostro 15 3568 (Z553505UIN9)