Countdown star Rachel Riley, 34, is known for her maths skills on the popular daytime show.The Channel 4 star appeared to falter under pressure during a quiz on Capital FM Breakfast today.The mum-of-one joined radio hosts Roman Kemp and Sian Welby for their morning show, where the mathematician was quizzed on what IQ stands for.But Rachel struggled to answer the question and claimed it stood for "intelligence quid"..
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