The low ratio of working moms sparked concern at Regus.

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It is also working on a gender equality action plan to boost its ratio of female leaders though it admits it will miss its slated target of 30% by end 2013.

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It found that for younger working households throughout Wales, the average house price to income ratio is now more than four to one.

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But accurately working out Mathilde's volume (necessary because density is the ratio of mass to volume) was harder.

ECONOMIST: Asteroids

Since then, the working population has aged, so the employment-to-population ratio will be persistently lower even in good times.

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Between 2010 and 2050, the ratio of those age 65 and over as a share of the working age population will almost double.

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Across Europe, the dependency ratio of older people (aged 65 and over) to those of working age (15-64) will double from one-to-four to one-to-two by 2050.

ECONOMIST: Economics focus