If the population of Bridgetown increased 8% over the last decade to a population of 54,000, what was its population ten years ago? HELP I NEED TO TURN IT IN

Ineed in figuring out this problem.

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)

Mr. thompson took five of his children to the bowling alley the cost for children 12 and older is 350 the cost of four children under 12 inch to 25 he spent a total of 1625 how many of his children are 12 and order