GRE Exam Numerical Ability Time and Work

if 2 persons can complete awork in 8 days and 1 persons can complete his work in 24 days .how much days will second person take to compete thair wok alone

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GRE Other Question

IN a class of 15 students 7 read latin,8 read greeks,3 not either.how many of them read both latin and greek?
the cost price of 16 apples is equal to the selling price of 10 apples. the cost price of 12 oranges is equal to the selling price of 16 oranges and the cost price of 6 mangoes is equal to the selling price of 4 mangoes . if the ratio of the cost price of 1 apple, 1 orange, and 1 mango in the ratio of 1:1:2,then find the net profit percent on the sale of 1 apple,2 oranges and 2 mangoes.