Akindergarten teacher purchased 18 yards of ribbon. she cut the ribbon into several pieces, each 3/4 yard long. how many pieces did she get?
a) 6
b) 13
c) 28
d) 24

I'm so close to finishing all these.

20 sharpened pencils are placed in a box containing an unknown number of unsharpened pencils suppose 15 pencils are removed at random and five of the remove pencils are sharpened based on this is it reasonable to assume that the number of unsharpened pencil is 40 explain your reasoning

The number of volunteers to walk dogs at the local animal shelter last year was 20. this year, the number of volunteers has risen to 50. what is the percent of increase in the number of volunteers?