There are four hundred students as thompson middle school. if 54% of the students are female, what is the ratio of female to male students?

Is a currency whose value is tied to another currency, meaning that the exchange is fixed

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

Each person in an it department of 25 people works on at least one of 3 major projects: system security, program implementation, platform development. 10 people work on system security, 13 work on program implementation, and 12 work on platform development. 4 people work on system security and platform development, 5 people work on program implementation and platform development, and 2 people work on all three projects. how many people work on system security and program implementation?