Exam Maths Puzzle Numerical Ability

A takes twice as long as B & C together take to do a piece of work & B takes twice as long as A & C together . However , the 3 men together can complete the work in 30 days. How long will C alone do the whole work ?

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Exam Other Question

if steven can make 20 drinks in 5 minutes, sue can make 20 drinks in 10 minutes and jack can make 20 in 15 minutes. How much time will it take all three of them working together to make 20 drinks Find the slope of the line 7x + 63y = 28.
Find the y-intercept of the equation