Final answer:
Henry weighs 10 kilograms, which converts to approximately 22 pounds when using the conversion factor of 1 kilogram which is equal to 2.20462 pounds.
Step-by-step explanation:
The question involves converting a weight measurement from kilograms to pounds. Since Henry is 18 months old and weighs 10 kilograms, to find out how many pounds he weighs, we use the conversion factor where 1 kilogram is approximately equal to 2.20462 pounds. By multiplying Henry's weight in kilograms by this conversion factor:
10 kg × 2.20462 = 22.0462 pounds.
When rounding to a more practical figure, especially considering that weight is commonly rounded to the nearest pound for body weight measurements, Henry's weight is approximately 22 pounds.