exam Maths Puzzle Numerical Ability

A survey of 400 people found that 66 were left-handed, What percent of those surveyed were left handed?

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What is a super imposed line and what are unique solutions? one machine in print shop can prodce a certain number of pages twice as fast as another machine.operating together,these machines can produce this number of pages in 8 mins.how long would it take each machine,working alone,to produce this number of pages?