exam Maths Puzzle Numerical Ability

I can wallpaper a room in 5 hours and my friend can do it in 6 hours. What part of the job can they do by working together for 1.5 hours? in x hours? PLEASE HELP!!!! The answer is

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Add or Subtract as indicated. Express your result in simplest form.

2/5w + 10 - 3/2w - 4 Which of the following assumptions are required for ANOVA?
A) Each population is normally distributed
B) The populations have equal variances
C) The errors are both random an