In a cashbox filled with $1, $5, $10, and $20 bills, there is a total of $400. The number of $5 bills was 4 times the number of $10 bills and the number of $1 bills was 10 more than the number of $10 bills. There are four $20 bills. How many bills of each type were in the cashbox?

One-third of the people from country a claim that they are from country b, and the rest admit they are from country a. one-fourth of the people from country claim that they are from country a, and the rest admit they are from country b. in a combined census of the two countries, one-half of the total claimed to be from a. what is the ratio of the populations of country a to that of country b.

Will used 20 colored tiles to make a design in art class. 5/20 of his tiles were red. what is an equivalent fraction for the red tiles?

Which of the following is an equation of a line parallel to the equation y=4x+1?