exam Maths Puzzle Numerical Ability

A disc jockey must play 12 commercial spots during 1 hour of a radio show. Each commercial is either 30 seconds or 60 seconds long. If the total commercial time during 1 hour is 8

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A parking meter accepts only Quarters and dollars. If there are 31 coins and a value of $ 20.50 how many quarters and dollars are there.

thanks for any help coming my way ) Statistics. A survey of 400 people found that 66 were left-handed. What percent of those surveyed were left-handed?