Example sentences of "a [det] [num] [noun pl] per [noun sg] " in BNC.

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1 This is much higher than the typical velocities of galactic masers ( less than a few hundred kilometres per second ) .
2 However , no more than about a dozen viruses have been produced on a commercial scale and only a few of these have been used on more than a few hundred hectares per year .
3 Sometimes , even on the strictest of diets , allowing only a few hundred calories per day , it seems impossible to shift even a small amount of weight per week .
4 The most obvious result of the evolving technology is increased speed , from a few thousand instructions per second to several millions or tens of millions of instructions per second .
5 It is the chief active ingredient in vinegar but the world 's consumption of about two and a half million tonnes per year is used for more than sprinkling on fish and chips .
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