A machine makes 20 carpets in a day. After oiling the machine, its efficiency will go up by 150%. How many carpets will be produced at this level?

To find out how many carpets will be produced at the increased efficiency level of the machine, you need to follow these steps:

Step 1: Calculate the increased efficiency using the given information. The machine's efficiency will go up by 150%, which means it will be 100% + 150% = 250% of its current efficiency.

Step 2: Convert the percentage to a decimal by dividing it by 100. In this case, 250 / 100 = 2.5.

Step 3: Multiply the current production rate of the machine (20 carpets) by the increased efficiency (2.5) to find the new production rate.

Mathematically, it can be written as:
New production rate = Current production rate * Increased efficiency
New production rate = 20 carpets * 2.5
New production rate = 50 carpets

Therefore, the machine will produce 50 carpets at the increased efficiency level.