book Maths Puzzle Numerical Ability

Angela and Laura found a great sale.
Angela bought one t-shirt and 4 pairs of shorts for $72.
Laura bought two t-shirts and 6 pairs of shorts for $114.
How much do the t-shir

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it takes a passanger train 2 hous less time than it takes a freight train to make the trip from central city to clear creek. the passenger train averages 96 km/h while the freight train averages 64 km/h. How far is it from central city to clear creek? I need to find out (for economics) how to graph the following:
Px = (400/3) + (1/3)Qs
This is for supply and demand. Isn't it true that to graph you set p=0 then solve for q? And