book Maths Puzzle Numerical Ability

what is 3n minus 2/5 = 7/10

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need to know how to work this question out: if the average time taken to answer calls in the first six months was 20.2 mins and in the next six months was 15.425 than was the %age change greater than 20%? The time required to complete a job varies inversely as the number of people working. It too 4 hours for 7 electricians to wire a buikding. How long would it have taken 3 electricians to have done the job?