exam Maths Puzzle Numerical Ability

2x+x=180
solve for x

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exam Other Question

A bookstore offers wireless Internet access to itscustomers for a charge.The cost is $1.50+m over 20,m=# of minutes.
How much would it be for 40 minutes?
I have a table that looks like this :

K 7 10 13 16
L 2 3 4 5

and i am supossed to make an equation that shows the relation between both K and L. I have solved p