Subtract 15 cm 2cm from 20

See explanation

Explanation:

Your question isn't clear but let me give you different scenarios.

1. Subtract 15cm from 2m

First and foremost, we have to realize that 1m = 100cm, therefore 2m = 2 × 100cm = 200cm

To subtract 15cm from 2m would be:

= 2m - 15cm

= 200cm - 15cm

= 185cm

= 1.85m

2. Subtract 15.2cm from 20.

This will give: = 20 - 15.2cm

3. Subtract 15cm from 20cm

This will be:

= 20cm - 15cm

= 5cm

4. Subtract 15.2cm from 20cm. This will be:

= 20cm - 15.2cm

= 4.8cm

0.367, he is a scammer.

Explanation:

We can calculate the maximum efficiency of a heat engine using both its hot and cold temperatures, which in our case are and , with the formula:

So for our case we have:

Which means a maximum efficiency of 36.7%, so it cannot have an efficiency of 45% and this "inventor" is scamming people.