Ben is the youngest of 4 children. Bob is 5 years older than Ben, Bridget is twice as old as Bob, and Brian is 3 years younger than Bridget. If the sum of their combined age 34, how old is each child.

Last year, laura had $30,000 to invest. she invested some of it in an account that paid 7% simple interest per year, and she invested the rest in an account that paid 8% simple interest per year. after one year, she received a total of $2230 in interest. how much did she invest in each account?