Astudent simplified a fraction to 2/5 by removing the common factors of 2 and 7. what was the original fraction?

An unknown number of kids and buses are getting assigned. when assigning 4 kids to each bus, there are 2 kids that aren't placed in a bus. when assigning 8 kids to each bus, there are 2 empty buses. how many total kids are there?

Arecipe uses 2 cups of sugar to make 32 brownies. how many cups of sugar are needed to make 72 brownies?

Valentina is subtracting from . she finds the lcd to be 15y2. what is valentina's next step?