Suppose the mass of a dog is 90 pounds. If 1 kilogram is equal to 2.2 pounds, what is the mass of the dog in kilograms?

##=41## kg (rounded to two significant digits).

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Suppose the mass of a dog is 90 pounds. If 1 kilogram is equal to 2.2 pounds, what is the mass of the dog in kilograms?
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This problem is of “Unitary method“.
It is always a good idea to keep the the asked quantity towards the right side of = sign.

2.2 pounds of mass = 1 kg
1 pound of mass = ##1/2.2## kg
90 pounds of mass = ##1/2.2 xx 90## kg
##=40.dot 9 dot 0## kg

Using the rule for rounding off for multiplication or division.
We observe that in the given numbers there are 2 least significant digits.
##=41## kg (rounded to two significant digits).

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