What was the original number if after 40% it became 420

Cora bought a package of erasers. there are 4 pink erasers and 12 blue erasers. what is the ratio of pink erasers to blue erasers?

Ellen makes and sells bookmarks. she graphs the number of bookmarks sold compared to the total money earned. why is the rate of change for the function graphed to the left?

In order to be invited to tutoring or extension activities a students performance 20 point higher or lower than average for the