exam Maths Puzzle Numerical Ability

Noya drives into the city for a show. Because of traffic, she averages only 15mph. On her drive home she averages 35mph. If her total time s 2 hours, how long does it take her to drive into the city?

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write an equation equvialent to the verbal statement 'three times the sum of a number n and 7 is 16'please help your hepl will be well appriciated. A coffee merchant has coffee beans that sell for $9 per
pound and $12 per pound. The two types are to be mixed to create 100 lb of a mixture
that will sell for $11.25 per pound. How much of each type of bean should be
used in the mixture?