book Maths Puzzle Numerical Ability

thrity years ago gasoline cost 30 cents per gallon. Today gasoline averages about $1.65 per gallon. What is the percentage of increase in the cost of gasoline

How do i figure it out?

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book Other Question

x+1/2=-3/4

3/5x=-9

3x-3/5=12/5

5-5x=7x-3(5x-6) I need to know the equation for the following:

Kathryn drove her rig 5 hours before dawn and 6 hours after dawn. If her average speed was 5 miles per hour more in the dark and s