Donnie and Ronnie are trying to figure out how much they weigh in kilograms. They discovered that 1 kg equals 2.2 pounds. Donnie weighs 188 pounds. Ronnie weighs 165 pounds. What is the difference in their weight in kilograms round to the nearest hundredth.

To convert Donnie's weight to kilograms, we divide 188 by 2.2: 188 pounds / 2.2 pounds/kg = <<188/2.2=85.45>>85.45 kg

To convert Ronnie's weight to kilograms, we divide 165 by 2.2: 165 pounds / 2.2 pounds/kg = <<165/2.2=75>>75 kg
To find the difference in their weight, we subtract Ronnie's weight in kilograms from Donnie's weight in kilograms: 85.45 kg - 75 kg = <<85.45-75=10.45>>10.45 kg
We round to the nearest hundredth, which gives us 10.45 kg. Answer: \boxed{10.45}.

To find the weight difference in kilograms between Donnie and Ronnie, we need to convert their weights from pounds to kilograms.

First, let's convert Donnie's weight:
Donnie's weight = 188 pounds
To convert pounds to kilograms, we use the conversion factor 1 kg = 2.2 pounds:
Donnie's weight in kilograms = 188 pounds / 2.2 pounds/kg
Donnie's weight in kilograms = 85.45 kilograms (rounded to the nearest hundredth)

Now, let's convert Ronnie's weight:
Ronnie's weight = 165 pounds
To convert pounds to kilograms, we use the conversion factor 1 kg = 2.2 pounds:
Ronnie's weight in kilograms = 165 pounds / 2.2 pounds/kg
Ronnie's weight in kilograms = 75 kilograms (rounded to the nearest hundredth)

To find the weight difference in kilograms, we subtract Ronnie's weight from Donnie's weight:
Weight difference = Donnie's weight - Ronnie's weight
Weight difference = 85.45 kilograms - 75 kilograms
Weight difference = 10.45 kilograms (rounded to the nearest hundredth)

Therefore, the weight difference between Donnie and Ronnie in kilograms is approximately 10.45 kilograms.

To find the weight of Donnie and Ronnie in kilograms, we need to convert their weights in pounds to kilograms using the conversion factor given.

Let's start with Donnie's weight:
Donnie weighs 188 pounds. To convert this to kilograms, we'll divide his weight by the conversion factor:

188 pounds / 2.2 pounds per kilogram ≈ 85.45 kilograms

So, Donnie's weight is approximately 85.45 kilograms.

Now, let's calculate Ronnie's weight:
Ronnie weighs 165 pounds. Applying the same conversion factor, we have:

165 pounds / 2.2 pounds per kilogram ≈ 75 kilograms

Therefore, Ronnie's weight is approximately 75 kilograms.

To find the difference in their weights, we subtract Ronnie's weight from Donnie's weight:

Difference = Donnie's weight - Ronnie's weight
Difference = 85.45 kilograms - 75 kilograms
Difference ≈ 10.45 kilograms

Rounded to the nearest hundredth, the difference in their weights is approximately 10.45 kilograms.