Homework Help: math

Posted by anonymous on Tuesday, February 5, 2013 at 3:59pm.

If I had to convert 15 oz. to kg and it was given that 1 oz = 28.35 g and that 1 g = 1000 kg, how would I show my work to get the answer?

math - Steve, Tuesday, February 5, 2013 at 4:01pm
15 oz * 28.35g/oz * 1kg/1000g = 0.425 kg

note how the units cancel, just like common factors
math - anonymous, Tuesday, February 5, 2013 at 4:36pm
okay, thanks! can you also look at this one for me? I'm having trouble getting the right answer.
4 kg to oz.
1 oz = 28.35 g
1g = 1000 kg
4kg x 28.35 g/ 1oz = 113.4 g
113. 4 g x 1 oz / 1000kg = 0.11 oz
The answer is supposed to be 141 oz
math - Steve, Wednesday, February 6, 2013 at 3:29pm
gotta make the units cancel.
kg*g/oz makes no sense

kg * g/kg * oz/g = oz

4kg * 1000g/1kg * 1oz/28.35g = 141 oz
math - Steve, Wednesday, February 6, 2013 at 3:30pm
what you are doing is multiplying by 1, which does not alter the value

1oz = 28.35g, so

1oz/28.35g = 1
28.35g/1oz = 1

which one you use determines which units cancel

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