10. Tamara has 20 dolls. She wants to store them in boxes with an equal number
of dolls in each box. She does not want
any dolls left over. How can she divide
the dolls equally into boxes with none
left over?

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.