^ How much does a litre of petrol weigh?

Seeing as I live in a mostly-metric country, I should be able to answer this, but what if it's not water? Or if it's something denser/less dense than water?

It's all just easier. Try converting from feet to inches without a calculator. It's just a waste of time, and numbers.

Exactly!

737.22 grams :)?

There are 12 inches in a foot, so rudimentary math skills are all you really need. Hell, 6th graders who've memorized their times tables can convert feet to inches with ease.

87604923746 km = 87604923746 000 m
That needed less than 5 seconds.

^ im confused as to what your figures mean.

I never said it was easier, I'm just saying that standard measurement gets wrongly demonized because it's "too difficult" to calculate equivalencies. Standard is easy for those who grew up learning the stuff, and I really don't see the need to claim supremacy just because you prefer one to the other.

She's saying that it's easier to convert metric units because they are divisible by 10 or 100 as opposed to 12.

tbh, I agree.