book Maths Puzzle Numerical Ability

How do you change this fraction to an improper fraction?

13 2/5

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book Other Question

If Sally can paint a house in 4 hours and John can paint the house in 6 hours. How long will it take them to paint the house together?
TELL WEATHER THE RELATIONSHIP BETWEEN X AND Y IS LINEAR,EXPONENTIAL,OR NEITHER AND EXPLAIN THE ANSWER- X-0,1,2,3,4,5 -Y-1,1/4,1/16,1/64,1/256,1/1024 ?