The ratio of boy to girl students is 4 to 3.
What percentage [proportion] of the total expenditure is taken up by food costs?
We walked at 「the rate [a speed] of four kilometers per hour.
One in ten persons caught a cold this month.
Mix two parts oil to one part vinegar.
What is the percentage of female students at this university?
He arrived comparatively early today.
He is fairly [rather] tall.
I finished my homework sooner than I expected.
She played the piano very well, considering.