book Maths Puzzle Numerical Ability

Please help me on this question. In 1990, the population of Alabama was 4,040,587. In 2000, the population was 4,447,100. Find the percent of change from 1990 to 2000. i know the answer is 10.1% I just dont know how to work it. please help. thank you.

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book Other Question

Al is 4 years younger than Ed.
Let x = Ed's age.

Then___________ = Al's age.

Question 2
The Lions played 76 ball games.
They won 3 times as many games as they lost.
How m two cyclists starts from the same point and ride in opposite directions. onecyclist rides 5 mph faster than the other. in 5 hour the cyclists are 175 miles aparT. find the rate of the slower cyclist.