I need help with this

0.25+0.30+0.27 - 0.20

you wanna add up all of the values and then subtract by how much was taken out (0.20)

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.

Idon’t know what the answer is i wish i could